diff --git a/Doxyfile.in b/Doxyfile.in
index 386706ab..1364ff2d 100644
--- a/Doxyfile.in
+++ b/Doxyfile.in
@@ -564,7 +564,7 @@ REFERENCES_RELATION    = YES
 # If the REFERENCES_LINK_SOURCE tag is set to YES (the default)
 # and SOURCE_BROWSER tag is set to YES, then the hyperlinks from
 # functions in REFERENCES_RELATION and REFERENCED_BY_RELATION lists will
-# link to the source code.  Otherwise they will link to the documentstion.
+# link to the source code.  Otherwise they will link to the documentation.
 
 REFERENCES_LINK_SOURCE = YES
 
diff --git a/NEWS b/NEWS
index f2a1ad3b..d5dbabd5 100644
--- a/NEWS
+++ b/NEWS
@@ -21,7 +21,7 @@ XZ Utils Release Notes
     * xz:
 
         - Fix "xz --list --robot missing_or_bad_file.xz" which would
-          try to print an unitialized string and thus produce garbage
+          try to print an uninitialized string and thus produce garbage
           output. Since the exit status is non-zero, most uses of such
           a command won't try to interpret the garbage output.
 
diff --git a/src/liblzma/api/lzma/block.h b/src/liblzma/api/lzma/block.h
index 7bdcfd7c..962f3877 100644
--- a/src/liblzma/api/lzma/block.h
+++ b/src/liblzma/api/lzma/block.h
@@ -448,7 +448,7 @@ extern LZMA_API(lzma_vli) lzma_block_total_size(const lzma_block *block)
  *              - LZMA_MEM_ERROR
  *              - LZMA_OPTIONS_ERROR
  *              - LZMA_UNSUPPORTED_CHECK: block->check specifies a Check ID
- *                that is not supported by this buid of liblzma. Initializing
+ *                that is not supported by this build of liblzma. Initializing
  *                the encoder failed.
  *              - LZMA_PROG_ERROR
  */
diff --git a/src/liblzma/api/lzma/hardware.h b/src/liblzma/api/lzma/hardware.h
index 5321d9af..47481f25 100644
--- a/src/liblzma/api/lzma/hardware.h
+++ b/src/liblzma/api/lzma/hardware.h
@@ -6,7 +6,7 @@
  * ways to limit the resource usage. Applications linking against liblzma
  * need to do the actual decisions how much resources to let liblzma to use.
  * To ease making these decisions, liblzma provides functions to find out
- * the relevant capabilities of the underlaying hardware. Currently there
+ * the relevant capabilities of the underlying hardware. Currently there
  * is only a function to find out the amount of RAM, but in the future there
  * will be also a function to detect how many concurrent threads the system
  * can run.
diff --git a/src/liblzma/api/lzma/lzma12.h b/src/liblzma/api/lzma/lzma12.h
index 4e32fa3a..df5f23b6 100644
--- a/src/liblzma/api/lzma/lzma12.h
+++ b/src/liblzma/api/lzma/lzma12.h
@@ -301,7 +301,7 @@ typedef struct {
 	 * (2^ pb =2^2=4), which is often a good choice when there's
 	 * no better guess.
 	 *
-	 * When the aligment is known, setting pb accordingly may reduce
+	 * When the alignment is known, setting pb accordingly may reduce
 	 * the file size a little. E.g. with text files having one-byte
 	 * alignment (US-ASCII, ISO-8859-*, UTF-8), setting pb=0 can
 	 * improve compression slightly. For UTF-16 text, pb=1 is a good
diff --git a/src/liblzma/api/lzma/vli.h b/src/liblzma/api/lzma/vli.h
index 9ad13f2e..1b7a952a 100644
--- a/src/liblzma/api/lzma/vli.h
+++ b/src/liblzma/api/lzma/vli.h
@@ -54,7 +54,7 @@
  *
  * Valid VLI values are in the range [0, LZMA_VLI_MAX]. Unknown value is
  * indicated with LZMA_VLI_UNKNOWN, which is the maximum value of the
- * underlaying integer type.
+ * underlying integer type.
  *
  * lzma_vli will be uint64_t for the foreseeable future. If a bigger size
  * is needed in the future, it is guaranteed that 2 * LZMA_VLI_MAX will
diff --git a/src/liblzma/common/hardware_physmem.c b/src/liblzma/common/hardware_physmem.c
index 7405b658..a2bbbe29 100644
--- a/src/liblzma/common/hardware_physmem.c
+++ b/src/liblzma/common/hardware_physmem.c
@@ -19,7 +19,7 @@ extern LZMA_API(uint64_t)
 lzma_physmem(void)
 {
 	// It is simpler to make lzma_physmem() a wrapper for
-	// tuklib_physmem() than to hack appropriate symbol visiblity
+	// tuklib_physmem() than to hack appropriate symbol visibility
 	// support for the tuklib modules.
 	return tuklib_physmem();
 }
diff --git a/src/liblzma/common/index.c b/src/liblzma/common/index.c
index 007e1570..a41e8f33 100644
--- a/src/liblzma/common/index.c
+++ b/src/liblzma/common/index.c
@@ -105,7 +105,7 @@ typedef struct {
 
 
 typedef struct {
-	/// Every index_stream is a node in the tree of Sreams.
+	/// Every index_stream is a node in the tree of Streams.
 	index_tree_node node;
 
 	/// Number of this Stream (first one is 1)
@@ -166,7 +166,7 @@ struct lzma_index_s {
 	lzma_vli index_list_size;
 
 	/// How many Records to allocate at once in lzma_index_append().
-	/// This defaults to INDEX_GROUP_SIZE but can be overriden with
+	/// This defaults to INDEX_GROUP_SIZE but can be overridden with
 	/// lzma_index_prealloc().
 	size_t prealloc;
 
diff --git a/src/liblzma/common/stream_encoder_mt.c b/src/liblzma/common/stream_encoder_mt.c
index 2efe44c2..448d871c 100644
--- a/src/liblzma/common/stream_encoder_mt.c
+++ b/src/liblzma/common/stream_encoder_mt.c
@@ -958,7 +958,7 @@ stream_encoder_mt_init(lzma_next_coder *next, const lzma_allocator *allocator,
 	// Validate the filter chain so that we can give an error in this
 	// function instead of delaying it to the first call to lzma_code().
 	// The memory usage calculation verifies the filter chain as
-	// a side effect so we take advatange of that.
+	// a side effect so we take advantage of that.
 	if (lzma_raw_encoder_memusage(filters) == UINT64_MAX)
 		return LZMA_OPTIONS_ERROR;
 
diff --git a/src/liblzma/common/vli_decoder.c b/src/liblzma/common/vli_decoder.c
index c181828b..af2799d1 100644
--- a/src/liblzma/common/vli_decoder.c
+++ b/src/liblzma/common/vli_decoder.c
@@ -72,7 +72,7 @@ lzma_vli_decode(lzma_vli *restrict vli, size_t *vli_pos,
 		// corrupt.
 		//
 		// If we need bigger integers in future, old versions liblzma
-		// will confusingly indicate the file being corrupt istead of
+		// will confusingly indicate the file being corrupt instead of
 		// unsupported. I suppose it's still better this way, because
 		// in the foreseeable future (writing this in 2008) the only
 		// reason why files would appear having over 63-bit integers
diff --git a/src/liblzma/lz/lz_decoder.c b/src/liblzma/lz/lz_decoder.c
index c7086440..bb21d0d0 100644
--- a/src/liblzma/lz/lz_decoder.c
+++ b/src/liblzma/lz/lz_decoder.c
@@ -241,7 +241,7 @@ lzma_lz_decoder_init(lzma_next_coder *next, const lzma_allocator *allocator,
 	if (lz_options.dict_size < 4096)
 		lz_options.dict_size = 4096;
 
-	// Make dictionary size a multipe of 16. Some LZ-based decoders like
+	// Make dictionary size a multiple of 16. Some LZ-based decoders like
 	// LZMA use the lowest bits lzma_dict.pos to know the alignment of the
 	// data. Aligned buffer is also good when memcpying from the
 	// dictionary to the output buffer, since applications are
diff --git a/src/scripts/xzgrep.in b/src/scripts/xzgrep.in
index a1fd19cf..a570a905 100644
--- a/src/scripts/xzgrep.in
+++ b/src/scripts/xzgrep.in
@@ -200,7 +200,7 @@ for i; do
   )
   r=$?
 
-  # fail occured previously, nothing worse can happen
+  # fail occurred previously, nothing worse can happen
   test $res -gt 1 && continue
 
   test "$xz_status" -eq 0 || test "$xz_status" -eq 2 \
diff --git a/src/xz/args.c b/src/xz/args.c
index 341f29e1..688d7c3a 100644
--- a/src/xz/args.c
+++ b/src/xz/args.c
@@ -88,7 +88,7 @@ parse_block_list(char *str)
 			// There is no string, that is, a comma follows
 			// another comma. Use the previous value.
 			//
-			// NOTE: We checked earler that the first char
+			// NOTE: We checked earlier that the first char
 			// of the whole list cannot be a comma.
 			assert(i > 0);
 			opt_block_list[i] = opt_block_list[i - 1];
diff --git a/src/xz/coder.c b/src/xz/coder.c
index f36d1bf2..f5e8e847 100644
--- a/src/xz/coder.c
+++ b/src/xz/coder.c
@@ -635,7 +635,7 @@ coder_normal(file_pair *pair)
 	// only a single block is created.
 	uint64_t block_remaining = UINT64_MAX;
 
-	// next_block_remining for when we are in single-threaded mode and
+	// next_block_remaining for when we are in single-threaded mode and
 	// the Block in --block-list is larger than the --block-size=SIZE.
 	uint64_t next_block_remaining = 0;
 
@@ -718,7 +718,7 @@ coder_normal(file_pair *pair)
 				|| action == LZMA_FULL_BARRIER)) {
 			if (action == LZMA_SYNC_FLUSH) {
 				// Flushing completed. Write the pending data
-				// out immediatelly so that the reading side
+				// out immediately so that the reading side
 				// can decompress everything compressed so far.
 				if (io_write(pair, &out_buf, IO_BUFFER_SIZE
 						- strm.avail_out))
diff --git a/src/xz/main.c b/src/xz/main.c
index af550c45..d74caf37 100644
--- a/src/xz/main.c
+++ b/src/xz/main.c
@@ -159,7 +159,7 @@ main(int argc, char **argv)
 	// Initialize handling of error/warning/other messages.
 	message_init();
 
-	// Set hardware-dependent default values. These can be overriden
+	// Set hardware-dependent default values. These can be overridden
 	// on the command line, thus this must be done before args_parse().
 	hardware_init();
 
diff --git a/src/xz/mytime.h b/src/xz/mytime.h
index ea291eed..4505724c 100644
--- a/src/xz/mytime.h
+++ b/src/xz/mytime.h
@@ -43,5 +43,5 @@ extern void mytime_set_flush_time(void);
 ///
 /// This returns -1 if no timed flushing is used.
 ///
-/// The return value is inteded for use with poll().
+/// The return value is intended for use with poll().
 extern int mytime_get_flush_timeout(void);
diff --git a/src/xz/private.h b/src/xz/private.h
index e61563ac..d97c22cc 100644
--- a/src/xz/private.h
+++ b/src/xz/private.h
@@ -1,7 +1,7 @@
 ///////////////////////////////////////////////////////////////////////////////
 //
 /// \file       private.h
-/// \brief      Common includes, definions, and prototypes
+/// \brief      Common includes, definitions, and prototypes
 //
 //  Author:     Lasse Collin
 //
diff --git a/src/xz/xz.1 b/src/xz/xz.1
index 63087ca7..691bd2f8 100644
--- a/src/xz/xz.1
+++ b/src/xz/xz.1
@@ -1052,7 +1052,7 @@ if using more threads would exceed the memory usage limit.
 Currently the only threading method is to split the input into
 blocks and compress them independently from each other.
 The default block size depends on the compression level and
-can be overriden with the
+can be overridden with the
 .BI \-\-block\-size= size
 option.
 .IP ""
diff --git a/windows/build.bash b/windows/build.bash
index 4a6a2843..9a3ebe0c 100644
--- a/windows/build.bash
+++ b/windows/build.bash
@@ -112,7 +112,7 @@ buildit()
 	strip -vg "$DESTDIR/"*.a
 }
 
-# Copy files and convert newlines from LF to CR+LF. Optinally add a suffix
+# Copy files and convert newlines from LF to CR+LF. Optionally add a suffix
 # to the destination filename.
 #
 # The first argument is the destination directory. The second argument is