diff --git a/cc3200/README.md b/cc3200/README.md
index 753fd450a..53cad3ba0 100644
--- a/cc3200/README.md
+++ b/cc3200/README.md
@@ -138,7 +138,7 @@ If `WIPY_IP`, `WIPY_USER` or `WIPY_PWD` are omitted the default values (the ones
 ## Regarding old revisions of the CC3200-LAUNCHXL
 
 First silicon (pre-release) revisions of the CC3200 had issues with the ram blocks, and MicroPython cannot run
-there. Make sure to use a **v4.1 (or higer) LAUNCHXL board** when trying this port, otherwise it won't work.
+there. Make sure to use a **v4.1 (or higher) LAUNCHXL board** when trying this port, otherwise it won't work.
 
 ### Note regarding FileZilla
 
diff --git a/docs/library/btree.rst b/docs/library/btree.rst
index aebcbc160..bd7890586 100644
--- a/docs/library/btree.rst
+++ b/docs/library/btree.rst
@@ -69,7 +69,7 @@ Functions
 
    Open a database from a random-access `stream` (like an open file). All
    other parameters are optional and keyword-only, and allow to tweak advanced
-   paramters of the database operation (most users will not need them):
+   parameters of the database operation (most users will not need them):
 
    * `flags` - Currently unused.
    * `cachesize` - Suggested maximum memory cache size in bytes. For a
diff --git a/docs/library/machine.SD.rst b/docs/library/machine.SD.rst
index 0eb024602..608e95831 100644
--- a/docs/library/machine.SD.rst
+++ b/docs/library/machine.SD.rst
@@ -34,7 +34,7 @@ Methods
 
 .. method:: SD.init(id=0, pins=('GP10', 'GP11', 'GP15'))
 
-   Enable the SD card. In order to initalize the card, give it a 3-tuple:
+   Enable the SD card. In order to initialize the card, give it a 3-tuple:
    ``(clk_pin, cmd_pin, dat0_pin)``.
 
 .. method:: SD.deinit()
diff --git a/docs/library/machine.UART.rst b/docs/library/machine.UART.rst
index f9c8efef7..64ff28e1a 100644
--- a/docs/library/machine.UART.rst
+++ b/docs/library/machine.UART.rst
@@ -16,7 +16,7 @@ UART objects can be created and initialised using::
     uart = UART(1, 9600)                         # init with given baudrate
     uart.init(9600, bits=8, parity=None, stop=1) # init with given parameters
 
-Supported paramters differ on a board:
+Supported parameters differ on a board:
 
 Pyboard: Bits can be 7, 8 or 9. Stop can be 1 or 2. With `parity=None`,
 only 8 and 9 bits are supported.  With parity enabled, only 7 and 8 bits
diff --git a/docs/library/uhashlib.rst b/docs/library/uhashlib.rst
index cd0216dae..6b9a764ba 100644
--- a/docs/library/uhashlib.rst
+++ b/docs/library/uhashlib.rst
@@ -15,11 +15,11 @@ be implemented:
 
 * SHA1 - A previous generation algorithm. Not recommended for new usages,
   but SHA1 is a part of number of Internet standards and existing
-  applications, so boards targetting network connectivity and
+  applications, so boards targeting network connectivity and
   interoperatiability will try to provide this.
 
 * MD5 - A legacy algorithm, not considered cryptographically secure. Only
-  selected boards, targetting interoperatibility with legacy applications,
+  selected boards, targeting interoperatibility with legacy applications,
   will offer this.
 
 Constructors
diff --git a/docs/library/utime.rst b/docs/library/utime.rst
index 871f6c678..f3a067cde 100644
--- a/docs/library/utime.rst
+++ b/docs/library/utime.rst
@@ -146,8 +146,8 @@ Functions
    too distant inbetween, see below). The function returns **signed** value in the range
    [``-TICKS_PERIOD/2`` .. ``TICKS_PERIOD/2-1``] (that's a typical range definition for
    two's-complement signed binary integers). If the result is negative, it means that
-   ``ticks1`` occured earlier in time than ``ticks2``. Otherwise, it means that
-   ``ticks1`` occured after ``ticks2``. This holds ``only`` if ``ticks1`` and ``ticks2``
+   ``ticks1`` occurred earlier in time than ``ticks2``. Otherwise, it means that
+   ``ticks1`` occurred after ``ticks2``. This holds ``only`` if ``ticks1`` and ``ticks2``
    are apart from each other for no more than ``TICKS_PERIOD/2-1`` ticks. If that does
    not hold, incorrect result will be returned. Specifically, if two tick values are
    apart for ``TICKS_PERIOD/2-1`` ticks, that value will be returned by the function.
diff --git a/docs/sphinx_selective_exclude/README.md b/docs/sphinx_selective_exclude/README.md
index cc9725c21..dab140739 100644
--- a/docs/sphinx_selective_exclude/README.md
+++ b/docs/sphinx_selective_exclude/README.md
@@ -66,7 +66,7 @@ index for PDF, just the same as for HTML.
 search_auto_exclude
 -------------------
 
-Even if you exclude soem documents from toctree:: using only::
+Even if you exclude some documents from toctree:: using only::
 directive, they will be indexed for full-text search, so user may
 find them and get confused. This plugin follows very simple idea
 that if you didn't include some documents in the toctree, then
diff --git a/docs/sphinx_selective_exclude/modindex_exclude.py b/docs/sphinx_selective_exclude/modindex_exclude.py
index 18b49cc80..bf8db795e 100644
--- a/docs/sphinx_selective_exclude/modindex_exclude.py
+++ b/docs/sphinx_selective_exclude/modindex_exclude.py
@@ -2,7 +2,7 @@
 # This is a Sphinx documentation tool extension which allows to
 # exclude some Python modules from the generated indexes. Modules
 # are excluded both from "modindex" and "genindex" index tables
-# (in the latter case, all members of a module are exlcuded).
+# (in the latter case, all members of a module are excluded).
 # To control exclusion, set "modindex_exclude" variable in Sphinx
 # conf.py to the list of modules to exclude. Note: these should be
 # modules (as defined by py:module directive, not just raw filenames).
diff --git a/esp8266/README.md b/esp8266/README.md
index 897bb4737..d717d26fe 100644
--- a/esp8266/README.md
+++ b/esp8266/README.md
@@ -100,7 +100,7 @@ programming).
 
 __WiFi__
 
-Initally, the device configures itself as a WiFi access point (AP).
+Initially, the device configures itself as a WiFi access point (AP).
 - ESSID: MicroPython-xxxxxx (x’s are replaced with part of the MAC address).
 - Password: micropythoN (note the upper-case N).
 - IP address of the board: 192.168.4.1.
diff --git a/esp8266/machine_rtc.c b/esp8266/machine_rtc.c
index 019b705ba..b17bcb261 100644
--- a/esp8266/machine_rtc.c
+++ b/esp8266/machine_rtc.c
@@ -93,7 +93,7 @@ void pyb_rtc_set_us_since_2000(uint64_t nowus) {
     int64_t delta = nowus - (((uint64_t)rtc_last_ticks * cal) >> 12);
 
     // As the calibration value jitters quite a bit, to make the
-    // clock at least somewhat practially usable, we need to store it
+    // clock at least somewhat practically usable, we need to store it
     system_rtc_mem_write(MEM_CAL_ADDR, &cal, sizeof(cal));
     system_rtc_mem_write(MEM_DELTA_ADDR, &delta, sizeof(delta));
 };
diff --git a/examples/conwaylife.py b/examples/conwaylife.py
index f99796175..323f42e85 100644
--- a/examples/conwaylife.py
+++ b/examples/conwaylife.py
@@ -8,7 +8,7 @@ lcd.light(1)
 def conway_step():
     for x in range(128):        # loop over x coordinates
         for y in range(32):     # loop over y coordinates
-            # count number of neigbours
+            # count number of neighbours
             num_neighbours = (lcd.get(x - 1, y - 1) +
                 lcd.get(x, y - 1) +
                 lcd.get(x + 1, y - 1) +
@@ -25,7 +25,7 @@ def conway_step():
             if self and not (2 <= num_neighbours <= 3):
                 lcd.pixel(x, y, 0) # not enough, or too many neighbours: cell dies
             elif not self and num_neighbours == 3:
-                lcd.pixel(x, y, 1)   # exactly 3 neigbours around an empty cell: cell is born
+                lcd.pixel(x, y, 1)   # exactly 3 neighbours around an empty cell: cell is born
 
 # randomise the start
 def conway_rand():
diff --git a/examples/embedding/Makefile.upylib b/examples/embedding/Makefile.upylib
index 873c0fd34..4663ad30a 100644
--- a/examples/embedding/Makefile.upylib
+++ b/examples/embedding/Makefile.upylib
@@ -170,7 +170,7 @@ SRC_QSTR_AUTO_DEPS +=
 include $(MPTOP)/py/mkrules.mk
 
 # Value of configure's --host= option (required for cross-compilation).
-# Deduce it from CROSS_COMPILE by default, but can be overriden.
+# Deduce it from CROSS_COMPILE by default, but can be overridden.
 ifneq ($(CROSS_COMPILE),)
 CROSS_COMPILE_HOST = --host=$(patsubst %-,%,$(CROSS_COMPILE))
 else
diff --git a/examples/embedding/README.md b/examples/embedding/README.md
index 989ce1fc8..804dfede6 100644
--- a/examples/embedding/README.md
+++ b/examples/embedding/README.md
@@ -18,7 +18,7 @@ Building the example is as simple as running:
 It's worth to trace what's happening behind the scenes though:
 
 1. As a first step, a MicroPython library is built. This is handled by a
-seperate makefile, Makefile.upylib. It is more or less complex, but the
+separate makefile, Makefile.upylib. It is more or less complex, but the
 good news is that you won't need to change anything in it, just use it
 as is, the main Makefile shows how. What may require editing though is
 a MicroPython configuration file. MicroPython is highly configurable, so
diff --git a/extmod/modlwip.c b/extmod/modlwip.c
index c72849cf9..47669cb3a 100644
--- a/extmod/modlwip.c
+++ b/extmod/modlwip.c
@@ -373,7 +373,7 @@ STATIC err_t _lwip_tcp_recv(void *arg, struct tcp_pcb *tcpb, struct pbuf *p, err
 }
 
 /*******************************************************************************/
-// Functions for socket send/recieve operations. Socket send/recv and friends call
+// Functions for socket send/receive operations. Socket send/recv and friends call
 // these to do the work.
 
 // Helper function for send/sendto to handle UDP packets.
@@ -805,7 +805,7 @@ STATIC mp_obj_t lwip_socket_connect(mp_obj_t self_in, mp_obj_t addr_in) {
                     mp_raise_OSError(MP_EINPROGRESS);
                 }
             }
-            // Register our recieve callback.
+            // Register our receive callback.
             tcp_recv(socket->pcb.tcp, _lwip_tcp_recv);
             socket->state = STATE_CONNECTING;
             err = tcp_connect(socket->pcb.tcp, &dest, port, _lwip_tcp_connected);
diff --git a/extmod/modwebsocket.c b/extmod/modwebsocket.c
index 8200ea708..9e17d6a6d 100644
--- a/extmod/modwebsocket.c
+++ b/extmod/modwebsocket.c
@@ -132,7 +132,7 @@ STATIC mp_uint_t websocket_read(mp_obj_t self_in, void *buf, mp_uint_t size, int
 
                 self->buf_pos = 0;
                 self->to_recv = to_recv;
-                self->msg_sz = sz; // May be overriden by FRAME_OPT
+                self->msg_sz = sz; // May be overridden by FRAME_OPT
                 if (to_recv != 0) {
                     self->state = FRAME_OPT;
                 } else {
diff --git a/lib/timeutils/timeutils.c b/lib/timeutils/timeutils.c
index 0af39a295..06915f25a 100644
--- a/lib/timeutils/timeutils.c
+++ b/lib/timeutils/timeutils.c
@@ -165,7 +165,7 @@ mp_uint_t timeutils_mktime(mp_uint_t year, mp_int_t month, mp_int_t mday,
     //
     // tm_tomorrow = list(time.localtime())
     // tm_tomorrow[2] += 1 # Adds 1 to mday
-    // tomorrow = time.mktime(tm_tommorrow)
+    // tomorrow = time.mktime(tm_tomorrow)
     //
     // And not have to worry about all the weird overflows.
     //
diff --git a/lib/utils/stdout_helpers.c b/lib/utils/stdout_helpers.c
index 5f7a17d32..3de119757 100644
--- a/lib/utils/stdout_helpers.c
+++ b/lib/utils/stdout_helpers.c
@@ -9,7 +9,7 @@
  * implementation below can be used.
  */
 
-// Send "cooked" string of given length, where every occurance of
+// Send "cooked" string of given length, where every occurrence of
 // LF character is replaced with CR LF.
 void mp_hal_stdout_tx_strn_cooked(const char *str, size_t len) {
     while (len--) {
diff --git a/py/asmthumb.c b/py/asmthumb.c
index 749c1e405..7e92e4de4 100644
--- a/py/asmthumb.c
+++ b/py/asmthumb.c
@@ -52,7 +52,7 @@ void asm_thumb_end_pass(asm_thumb_t *as) {
 
     #if defined(MCU_SERIES_F7)
     if (as->base.pass == MP_ASM_PASS_EMIT) {
-        // flush D-cache, so the code emited is stored in memory
+        // flush D-cache, so the code emitted is stored in memory
         SCB_CleanDCache_by_Addr((uint32_t*)as->base.code_base, as->base.code_size);
         // invalidate I-cache
         SCB_InvalidateICache();
diff --git a/py/builtinimport.c b/py/builtinimport.c
index d01ebbe73..6994fc48f 100644
--- a/py/builtinimport.c
+++ b/py/builtinimport.c
@@ -271,7 +271,7 @@ mp_obj_t mp_builtin___import__(size_t n_args, const mp_obj_t *args) {
     if (level != 0) {
         // What we want to do here is to take name of current module,
         // chop <level> trailing components, and concatenate with passed-in
-        // module name, thus resolving relative import name into absolue.
+        // module name, thus resolving relative import name into absolute.
         // This even appears to be correct per
         // http://legacy.python.org/dev/peps/pep-0328/#relative-imports-and-name
         // "Relative imports use a module's __name__ attribute to determine that
@@ -441,7 +441,7 @@ mp_obj_t mp_builtin___import__(size_t n_args, const mp_obj_t *args) {
                     #if MICROPY_CPYTHON_COMPAT
                     // Store module as "__main__" in the dictionary of loaded modules (returned by sys.modules).
                     mp_obj_dict_store(MP_OBJ_FROM_PTR(&MP_STATE_VM(mp_loaded_modules_dict)), MP_OBJ_NEW_QSTR(MP_QSTR___main__), module_obj);
-                    // Store real name in "__main__" attribute. Choosen semi-randonly, to reuse existing qstr's.
+                    // Store real name in "__main__" attribute. Chosen semi-randonly, to reuse existing qstr's.
                     mp_obj_dict_store(MP_OBJ_FROM_PTR(o->globals), MP_OBJ_NEW_QSTR(MP_QSTR___main__), MP_OBJ_NEW_QSTR(mod_name));
                     #endif
                 }
diff --git a/py/compile.c b/py/compile.c
index 8533e0528..3b6a264d6 100644
--- a/py/compile.c
+++ b/py/compile.c
@@ -939,7 +939,7 @@ STATIC void c_del_stmt(compiler_t *comp, mp_parse_node_t pn) {
             }
         }
     } else {
-        // some arbitrary statment that we can't delete (eg del 1)
+        // some arbitrary statement that we can't delete (eg del 1)
         goto cannot_delete;
     }
 
@@ -1090,7 +1090,7 @@ STATIC void compile_import_name(compiler_t *comp, mp_parse_node_struct_t *pns) {
 STATIC void compile_import_from(compiler_t *comp, mp_parse_node_struct_t *pns) {
     mp_parse_node_t pn_import_source = pns->nodes[0];
 
-    // extract the preceeding .'s (if any) for a relative import, to compute the import level
+    // extract the preceding .'s (if any) for a relative import, to compute the import level
     uint import_level = 0;
     do {
         mp_parse_node_t pn_rel;
diff --git a/py/misc.h b/py/misc.h
index 146b9a8e4..caa5945bf 100644
--- a/py/misc.h
+++ b/py/misc.h
@@ -197,7 +197,7 @@ int DEBUG_printf(const char *fmt, ...);
 extern mp_uint_t mp_verbose_flag;
 
 // This is useful for unicode handling. Some CPU archs has
-// special instructions for efficient implentation of this
+// special instructions for efficient implementation of this
 // function (e.g. CLZ on ARM).
 // NOTE: this function is unused at the moment
 #ifndef count_lead_ones
diff --git a/py/mkenv.mk b/py/mkenv.mk
index eb1e44fef..b167b2533 100644
--- a/py/mkenv.mk
+++ b/py/mkenv.mk
@@ -32,7 +32,7 @@ ifeq ($(BUILD_VERBOSE),0)
 $(info Use make V=1 or set BUILD_VERBOSE in your environment to increase build verbosity.)
 endif
 
-# default settings; can be overriden in main Makefile
+# default settings; can be overridden in main Makefile
 
 PY_SRC ?= $(TOP)/py
 BUILD ?= build
diff --git a/py/mpconfig.h b/py/mpconfig.h
index a61d431e5..78e346d73 100644
--- a/py/mpconfig.h
+++ b/py/mpconfig.h
@@ -32,7 +32,7 @@
 
 // mpconfigport.h is a file containing configuration settings for a
 // particular port. mpconfigport.h is actually a default name for
-// such config, and it can be overriden using MP_CONFIGFILE preprocessor
+// such config, and it can be overridden using MP_CONFIGFILE preprocessor
 // define (you can do that by passing CFLAGS_EXTRA='-DMP_CONFIGFILE="<file.h>"'
 // argument to make when using standard MicroPython makefiles).
 // This is useful to have more than one config per port, for example,
diff --git a/py/obj.c b/py/obj.c
index 98ffa930b..493945a22 100644
--- a/py/obj.c
+++ b/py/obj.c
@@ -401,7 +401,7 @@ mp_obj_t mp_obj_id(mp_obj_t o_in) {
         return MP_OBJ_NEW_SMALL_INT(id);
     } else {
         // If that didn't work, well, let's return long int, just as
-        // a (big) positve value, so it will never clash with the range
+        // a (big) positive value, so it will never clash with the range
         // of small int returned in previous case.
         return mp_obj_new_int_from_uint((mp_uint_t)id);
     }
diff --git a/py/objstr.c b/py/objstr.c
index 70de0a693..a1e223572 100644
--- a/py/objstr.c
+++ b/py/objstr.c
@@ -798,7 +798,7 @@ STATIC mp_obj_t str_uni_strip(int type, size_t n_args, const mp_obj_t *args) {
     }
 
     assert(last_good_char_pos >= first_good_char_pos);
-    //+1 to accomodate the last character
+    //+1 to accommodate the last character
     size_t stripped_len = last_good_char_pos - first_good_char_pos + 1;
     if (stripped_len == orig_str_len) {
         // If nothing was stripped, don't bother to dup original string
@@ -1811,7 +1811,7 @@ STATIC mp_obj_t str_islower(mp_obj_t self_in) {
 }
 
 #if MICROPY_CPYTHON_COMPAT
-// These methods are superfluous in the presense of str() and bytes()
+// These methods are superfluous in the presence of str() and bytes()
 // constructors.
 // TODO: should accept kwargs too
 STATIC mp_obj_t bytes_decode(size_t n_args, const mp_obj_t *args) {
diff --git a/py/py.mk b/py/py.mk
index 5ff1fd6a6..70891677d 100644
--- a/py/py.mk
+++ b/py/py.mk
@@ -25,7 +25,7 @@ ifeq ($(MICROPY_SSL_AXTLS),1)
 CFLAGS_MOD += -DMICROPY_SSL_AXTLS=1 -I../lib/axtls/ssl -I../lib/axtls/crypto -I../lib/axtls/config
 LDFLAGS_MOD += -Lbuild -laxtls
 else ifeq ($(MICROPY_SSL_MBEDTLS),1)
-# Can be overriden by ports which have "builtin" mbedTLS
+# Can be overridden by ports which have "builtin" mbedTLS
 MICROPY_SSL_MBEDTLS_INCLUDE ?= ../lib/mbedtls/include
 CFLAGS_MOD += -DMICROPY_SSL_MBEDTLS=1 -I$(MICROPY_SSL_MBEDTLS_INCLUDE)
 LDFLAGS_MOD += -L../lib/mbedtls/library -lmbedx509 -lmbedtls -lmbedcrypto
diff --git a/py/ringbuf.h b/py/ringbuf.h
index 5662594f7..5e108afad 100644
--- a/py/ringbuf.h
+++ b/py/ringbuf.h
@@ -33,7 +33,7 @@ typedef struct _ringbuf_t {
     uint16_t iput;
 } ringbuf_t;
 
-// Static initalization:
+// Static initialization:
 // byte buf_array[N];
 // ringbuf_t buf = {buf_array, sizeof(buf_array)};
 
diff --git a/py/stream.c b/py/stream.c
index c915110e0..d3fc767bb 100644
--- a/py/stream.c
+++ b/py/stream.c
@@ -51,7 +51,7 @@ STATIC mp_obj_t stream_readall(mp_obj_t self_in);
 #define STREAM_CONTENT_TYPE(stream) (((stream)->is_text) ? &mp_type_str : &mp_type_bytes)
 
 // Returns error condition in *errcode, if non-zero, return value is number of bytes written
-// before error condition occured. If *errcode == 0, returns total bytes written (which will
+// before error condition occurred. If *errcode == 0, returns total bytes written (which will
 // be equal to input size).
 mp_uint_t mp_stream_rw(mp_obj_t stream, void *buf_, mp_uint_t size, int *errcode, byte flags) {
     byte *buf = buf_;
diff --git a/py/vm.c b/py/vm.c
index 5094e3e45..ad3d9e29c 100644
--- a/py/vm.c
+++ b/py/vm.c
@@ -947,7 +947,7 @@ unwind_jump:;
                     DECODE_UINT;
                     // unum & 0xff == n_positional
                     // (unum >> 8) & 0xff == n_keyword
-                    // We have folowing stack layout here:
+                    // We have following stack layout here:
                     // fun arg0 arg1 ... kw0 val0 kw1 val1 ... seq dict <- TOS
                     sp -= (unum & 0xff) + ((unum >> 7) & 0x1fe) + 2;
                     #if MICROPY_STACKLESS
@@ -1018,7 +1018,7 @@ unwind_jump:;
                     DECODE_UINT;
                     // unum & 0xff == n_positional
                     // (unum >> 8) & 0xff == n_keyword
-                    // We have folowing stack layout here:
+                    // We have following stack layout here:
                     // fun self arg0 arg1 ... kw0 val0 kw1 val1 ... seq dict <- TOS
                     sp -= (unum & 0xff) + ((unum >> 7) & 0x1fe) + 3;
                     #if MICROPY_STACKLESS
diff --git a/qemu-arm/README.md b/qemu-arm/README.md
index 329ae4d92..0cf93c7d5 100644
--- a/qemu-arm/README.md
+++ b/qemu-arm/README.md
@@ -4,7 +4,7 @@ provided by QEMU (http://qemu.org).
 The purposes of this port are to enable:
 
 1. Continuous integration
-    - run tests agains architecture-specific parts of code base
+    - run tests against architecture-specific parts of code base
 2. Experimentation
     - simulation & prototyping of anything that has architecture-specific
       code
diff --git a/tests/basics/namedtuple1.py b/tests/basics/namedtuple1.py
index 132dcf96b..70372f7ca 100644
--- a/tests/basics/namedtuple1.py
+++ b/tests/basics/namedtuple1.py
@@ -76,7 +76,7 @@ T4 = namedtuple("TupTuple", ("foo", "bar"))
 t = T4(1, 2)
 print(t.foo, t.bar)
 
-# Try single string with comma field seperator
+# Try single string with comma field separator
 # Not implemented so far
 #T2 = namedtuple("TupComma", "foo,bar")
 #t = T2(1, 2)
diff --git a/tests/basics/try_reraise2.py b/tests/basics/try_reraise2.py
index d9434397c..5648d2467 100644
--- a/tests/basics/try_reraise2.py
+++ b/tests/basics/try_reraise2.py
@@ -1,4 +1,4 @@
-# Reraise not the latest occured exception
+# Reraise not the latest occurred exception
 def f():
     try:
         raise ValueError("val", 3)
diff --git a/tests/pyb/can.py b/tests/pyb/can.py
index 617eb7ccc..7f2d070ec 100644
--- a/tests/pyb/can.py
+++ b/tests/pyb/can.py
@@ -158,7 +158,7 @@ print(can.recv(1))
 
 del can
 
-# Testing asyncronous send
+# Testing asynchronous send
 can = CAN(1, CAN.LOOPBACK)
 can.setfilter(0, CAN.MASK16, 0, (0, 0, 0, 0))
 
diff --git a/tests/thread/stress_aes.py b/tests/thread/stress_aes.py
index ecc963c92..df75e616c 100644
--- a/tests/thread/stress_aes.py
+++ b/tests/thread/stress_aes.py
@@ -8,7 +8,7 @@
 #
 # The AES code comes first (code originates from a C version authored by D.P.George)
 # and then the test harness at the bottom.  It can be tuned to be more/less
-# agressive by changing the amount of data to encrypt, the number of loops and
+# aggressive by changing the amount of data to encrypt, the number of loops and
 # the number of threads.
 #
 # MIT license; Copyright (c) 2016 Damien P. George on behalf of Pycom Ltd
diff --git a/tests/wipy/uart.py b/tests/wipy/uart.py
index a3a1c14e8..8e794015d 100644
--- a/tests/wipy/uart.py
+++ b/tests/wipy/uart.py
@@ -95,7 +95,7 @@ print(uart1.read() == None)
 print(uart1.write(b'123') == 3)
 print(uart0.read() == b'123')
 
-# no pin assignemnt
+# no pin assignment
 uart0 = UART(0, 1000000, pins=(None, None))
 print(uart0.write(b'123456789') == 9)
 print(uart1.read() == None)
diff --git a/tools/insert-usb-ids.py b/tools/insert-usb-ids.py
index 420db34c5..cdccd3be9 100644
--- a/tools/insert-usb-ids.py
+++ b/tools/insert-usb-ids.py
@@ -1,4 +1,4 @@
-# Reads the USB VID and PID from the file specifed by sys.arg[1] and then
+# Reads the USB VID and PID from the file specified by sys.argv[1] and then
 # inserts those values into the template file specified by sys.argv[2],
 # printing the result to stdout
 
diff --git a/tools/pyboard.py b/tools/pyboard.py
index 5eac030bd..921ffc52d 100755
--- a/tools/pyboard.py
+++ b/tools/pyboard.py
@@ -69,7 +69,7 @@ class TelnetToSerial:
                 self.tn.write(bytes(password, 'ascii') + b"\r\n")
 
                 if b'for more information.' in self.tn.read_until(b'Type "help()" for more information.', timeout=read_timeout):
-                    # login succesful
+                    # login successful
                     from collections import deque
                     self.fifo = deque()
                     return
diff --git a/unix/Makefile b/unix/Makefile
index 837ddf2b7..006bce0ef 100644
--- a/unix/Makefile
+++ b/unix/Makefile
@@ -262,7 +262,7 @@ coverage_test: coverage
 	gcov -o build-coverage/extmod ../extmod/*.c
 
 # Value of configure's --host= option (required for cross-compilation).
-# Deduce it from CROSS_COMPILE by default, but can be overriden.
+# Deduce it from CROSS_COMPILE by default, but can be overridden.
 ifneq ($(CROSS_COMPILE),)
 CROSS_COMPILE_HOST = --host=$(patsubst %-,%,$(CROSS_COMPILE))
 else
diff --git a/unix/modsocket.c b/unix/modsocket.c
index 9ca04b88b..c7be6461e 100644
--- a/unix/modsocket.c
+++ b/unix/modsocket.c
@@ -58,7 +58,7 @@
   from socket_more_funcs2 import *
   -------------------
   I.e. this module should stay lean, and more functions (if needed)
-  should be add to seperate modules (C or Python level).
+  should be add to separate modules (C or Python level).
  */
 
 #define MICROPY_SOCKET_EXTRA (0)
diff --git a/windows/windows_mphal.c b/windows/windows_mphal.c
index 1dd3105d8..a73140e54 100644
--- a/windows/windows_mphal.c
+++ b/windows/windows_mphal.c
@@ -72,7 +72,7 @@ void mp_hal_stdio_mode_orig(void) {
 // Previous versions of the mp_hal code would install a handler whenever Ctrl-C input is
 // allowed and remove the handler again when it is not. That is not necessary though (1),
 // and it might introduce problems (2) because console notifications are delivered to the
-// application in a seperate thread. 
+// application in a separate thread.
 // (1) mp_hal_set_interrupt_char effectively enables/disables processing of Ctrl-C via the
 // ENABLE_PROCESSED_INPUT flag so in raw mode console_sighandler won't be called.
 // (2) if mp_hal_set_interrupt_char would remove the handler while Ctrl-C was issued earlier,
diff --git a/zephyr/modutime.c b/zephyr/modutime.c
index 378068bb3..0c268046a 100644
--- a/zephyr/modutime.c
+++ b/zephyr/modutime.c
@@ -36,7 +36,7 @@
 #include "extmod/utime_mphal.h"
 
 STATIC mp_obj_t mod_time_time(void) {
-    /* The absense of FP support is deliberate. The Zephyr port uses
+    /* The absence of FP support is deliberate. The Zephyr port uses
      * single precision floats so the fraction component will start to
      * lose precision on devices with a long uptime.
      */