diff --git a/contrib/amcheck/verify_nbtree.c b/contrib/amcheck/verify_nbtree.c
index 20da4a46ba3..70f65b645a6 100644
--- a/contrib/amcheck/verify_nbtree.c
+++ b/contrib/amcheck/verify_nbtree.c
@@ -1086,7 +1086,7 @@ bt_entry_unique_check(BtreeCheckState *state, IndexTuple itup,
 
 	/*
 	 * Current tuple has no posting list. If TID is visible save info about it
-	 * for the next comparisons in the loop in bt_page_check(). Report
+	 * for the next comparisons in the loop in bt_target_page_check(). Report
 	 * duplicate if lVis_tid is already valid.
 	 */
 	else
@@ -1953,7 +1953,7 @@ bt_target_page_check(BtreeCheckState *state)
  * Note that !readonly callers must reverify that target page has not
  * been concurrently deleted.
  *
- * Save rightfirstdataoffset for detailed error message.
+ * Save rightfirstoffset for detailed error message.
  */
 static BTScanInsert
 bt_right_page_check_scankey(BtreeCheckState *state, OffsetNumber *rightfirstoffset)
diff --git a/doc/src/sgml/regress.sgml b/doc/src/sgml/regress.sgml
index d7e78204adc..d1042e02228 100644
--- a/doc/src/sgml/regress.sgml
+++ b/doc/src/sgml/regress.sgml
@@ -331,7 +331,7 @@ make check-world PG_TEST_EXTRA='kerberos ldap ssl load_balance libpq_encryption'
      <term><literal>xid_wraparound</literal></term>
      <listitem>
       <para>
-       Runs the test suite under <filename>src/test/module/xid_wrapround</filename>.
+       Runs the test suite under <filename>src/test/modules/xid_wraparound</filename>.
        Not enabled by default because it is resource intensive.
       </para>
      </listitem>
diff --git a/doc/src/sgml/targets-meson.txt b/doc/src/sgml/targets-meson.txt
index 1c42dd30285..bd470c87a70 100644
--- a/doc/src/sgml/targets-meson.txt
+++ b/doc/src/sgml/targets-meson.txt
@@ -11,7 +11,7 @@ Code Targets:
   backend                       Build backend and related modules
   bin                           Build frontend binaries
   contrib                       Build contrib modules
-  pl                            Build procedual languages
+  pl                            Build procedural languages
 
 Developer Targets:
   reformat-dat-files            Rewrite catalog data files into standard format
diff --git a/src/backend/access/brin/brin.c b/src/backend/access/brin/brin.c
index bf28400dd84..d0f3848c952 100644
--- a/src/backend/access/brin/brin.c
+++ b/src/backend/access/brin/brin.c
@@ -2598,7 +2598,7 @@ _brin_parallel_heapscan(BrinBuildState *state)
  *
  * After waiting for all workers to finish, merge the per-worker results into
  * the complete index. The results from each worker are sorted by block number
- * (start of the page range). While combinig the per-worker results we merge
+ * (start of the page range). While combining the per-worker results we merge
  * summaries for the same page range, and also fill-in empty summaries for
  * ranges without any tuples.
  *
diff --git a/src/backend/access/transam/slru.c b/src/backend/access/transam/slru.c
index f99ec38a4a1..77b05cc0a74 100644
--- a/src/backend/access/transam/slru.c
+++ b/src/backend/access/transam/slru.c
@@ -228,7 +228,6 @@ SimpleLruAutotuneBuffers(int divisor, int max)
  * name: name of SLRU.  (This is user-visible, pick with care!)
  * nslots: number of page slots to use.
  * nlsns: number of LSN groups per page (set to zero if not relevant).
- * ctllock: LWLock to use to control access to the shared control structure.
  * subdir: PGDATA-relative subdirectory that will contain the files.
  * buffer_tranche_id: tranche ID to use for the SLRU's per-buffer LWLocks.
  * bank_tranche_id: tranche ID to use for the bank LWLocks.
diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index 34a2c71812d..c3fd9c1eaed 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -8507,7 +8507,7 @@ xlog_redo(XLogReaderState *record)
 
 /*
  * Return the extra open flags used for opening a file, depending on the
- * value of the GUCs wal_sync_method, fsync and io_direct.
+ * value of the GUCs wal_sync_method, fsync and debug_io_direct.
  */
 static int
 get_sync_bit(int method)
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index 136cc42a92f..922ba79ac25 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -2465,7 +2465,7 @@ AddRelationNewConstraints(Relation rel,
 				 * Check against pre-existing constraints.  If we are allowed
 				 * to merge with an existing constraint, there's no more to do
 				 * here. (We omit the duplicate constraint from the result,
-				 * which is what ATAddCheckConstraint wants.)
+				 * which is what ATAddCheckNNConstraint wants.)
 				 */
 				if (MergeWithExistingConstraint(rel, ccname, expr,
 												allow_merge, is_local,
diff --git a/src/backend/executor/nodeValuesscan.c b/src/backend/executor/nodeValuesscan.c
index 78b512931b3..92948917a08 100644
--- a/src/backend/executor/nodeValuesscan.c
+++ b/src/backend/executor/nodeValuesscan.c
@@ -18,7 +18,6 @@
  *		ExecValuesScan			scans a values list.
  *		ExecValuesNext			retrieve next tuple in sequential order.
  *		ExecInitValuesScan		creates and initializes a valuesscan node.
- *		ExecEndValuesScan		releases any storage allocated.
  *		ExecReScanValuesScan	rescans the values list
  */
 #include "postgres.h"
diff --git a/src/backend/nodes/queryjumblefuncs.c b/src/backend/nodes/queryjumblefuncs.c
index be823a7f8fa..129fb447099 100644
--- a/src/backend/nodes/queryjumblefuncs.c
+++ b/src/backend/nodes/queryjumblefuncs.c
@@ -57,7 +57,6 @@ static void RecordConstLocation(JumbleState *jstate, int location);
 static void _jumbleNode(JumbleState *jstate, Node *node);
 static void _jumbleA_Const(JumbleState *jstate, Node *node);
 static void _jumbleList(JumbleState *jstate, Node *node);
-static void _jumbleRangeTblEntry(JumbleState *jstate, Node *node);
 
 /*
  * Given a possibly multi-statement source string, confine our attention to the
diff --git a/src/backend/replication/logical/slotsync.c b/src/backend/replication/logical/slotsync.c
index 39ff5fe9696..3f3e5941bce 100644
--- a/src/backend/replication/logical/slotsync.c
+++ b/src/backend/replication/logical/slotsync.c
@@ -1041,8 +1041,8 @@ ValidateSlotSyncParams(int elevel)
 	/*
 	 * Logical slot sync/creation requires wal_level >= logical.
 	 *
-	 * Sincle altering the wal_level requires a server restart, so error out
-	 * in this case regardless of elevel provided by caller.
+	 * Since altering the wal_level requires a server restart, so error out in
+	 * this case regardless of elevel provided by caller.
 	 */
 	if (wal_level < WAL_LEVEL_LOGICAL)
 		ereport(ERROR,
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index b3428e2ae49..302cd8e7f33 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -11632,7 +11632,7 @@ get_xmltable(TableFunc *tf, deparse_context *context, bool showimplicit)
 }
 
 /*
- * get_json_nested_columns - Parse back nested JSON_TABLE columns
+ * get_json_table_nested_columns - Parse back nested JSON_TABLE columns
  */
 static void
 get_json_table_nested_columns(TableFunc *tf, JsonTablePlan *plan,
diff --git a/src/backend/utils/adt/varlena.c b/src/backend/utils/adt/varlena.c
index d1b09dedfd4..dccd130c911 100644
--- a/src/backend/utils/adt/varlena.c
+++ b/src/backend/utils/adt/varlena.c
@@ -6284,7 +6284,7 @@ unicode_norm_form_from_string(const char *formstr)
 /*
  * Returns version of Unicode used by Postgres in "major.minor" format (the
  * same format as the Unicode version reported by ICU). The third component
- * ("update version") never involves additions to the character repertiore and
+ * ("update version") never involves additions to the character repertoire and
  * is unimportant for most purposes.
  *
  * See: https://unicode.org/versions/
diff --git a/src/bin/pg_combinebackup/pg_combinebackup.c b/src/bin/pg_combinebackup/pg_combinebackup.c
index 027a16a26ca..f4a1f499536 100644
--- a/src/bin/pg_combinebackup/pg_combinebackup.c
+++ b/src/bin/pg_combinebackup/pg_combinebackup.c
@@ -844,7 +844,7 @@ process_directory_recursively(Oid tsoid,
 	 * files requiring reconstruction. If such files occur outside these
 	 * directories, we want to just copy them straight to the output
 	 * directory. This is to protect against a user creating a file with a
-	 * strange name like INCREMENTAL.config and then compaining that
+	 * strange name like INCREMENTAL.config and then complaining that
 	 * incremental backups don't work properly. The test here is a bit tricky:
 	 * incremental files occur in subdirectories of base, in pg_global itself,
 	 * and in subdirectories of pg_tblspc only if in-place tablespaces are
diff --git a/src/bin/pg_dump/filter.c b/src/bin/pg_dump/filter.c
index 9fdb9cbdcd3..3fb93c5f155 100644
--- a/src/bin/pg_dump/filter.c
+++ b/src/bin/pg_dump/filter.c
@@ -204,7 +204,7 @@ filter_get_keyword(const char **line, int *size)
 }
 
 /*
- * read_quoted_pattern - read quoted possibly multi line string
+ * read_quoted_string - read quoted possibly multi line string
  *
  * Reads a quoted string which can span over multiple lines and returns a
  * pointer to next char after ending double quotes; it will exit on errors.
diff --git a/src/bin/pg_upgrade/check.c b/src/bin/pg_upgrade/check.c
index ad1f8e3bcb1..11e705e8ec8 100644
--- a/src/bin/pg_upgrade/check.c
+++ b/src/bin/pg_upgrade/check.c
@@ -1945,7 +1945,7 @@ check_old_cluster_subscription_state(void)
 									"	ON o.roname = 'pg_' || s.oid "
 									"INNER JOIN pg_catalog.pg_database d "
 									"	ON d.oid = s.subdbid "
-									"WHERE o.roname iS NULL;");
+									"WHERE o.roname IS NULL;");
 
 			ntup = PQntuples(res);
 			for (int i = 0; i < ntup; i++)
diff --git a/src/fe_utils/recovery_gen.c b/src/fe_utils/recovery_gen.c
index 733982a82f7..c4838a4bddc 100644
--- a/src/fe_utils/recovery_gen.c
+++ b/src/fe_utils/recovery_gen.c
@@ -20,7 +20,7 @@ static char *escape_quotes(const char *src);
  * return it.
  *
  * This accepts the dbname which will be appended to the primary_conninfo.
- * The dbname will be ignored by walreciever process but slotsync worker uses
+ * The dbname will be ignored by walreceiver process but slotsync worker uses
  * it to connect to the primary server.
  */
 PQExpBuffer
diff --git a/src/include/catalog/heap.h b/src/include/catalog/heap.h
index 21e31f9c974..e446d49b3ea 100644
--- a/src/include/catalog/heap.h
+++ b/src/include/catalog/heap.h
@@ -116,7 +116,7 @@ extern List *AddRelationNewConstraints(Relation rel,
 									   const char *queryString);
 extern List *AddRelationNotNullConstraints(Relation rel,
 										   List *constraints,
-										   List *additional_notnulls);
+										   List *old_notnulls);
 
 extern void RelationClearMissing(Relation rel);
 extern void SetAttrMissing(Oid relid, char *attname, char *value);
diff --git a/src/include/common/blkreftable.h b/src/include/common/blkreftable.h
index 42295b7c52b..43b913a82ec 100644
--- a/src/include/common/blkreftable.h
+++ b/src/include/common/blkreftable.h
@@ -44,7 +44,7 @@ typedef struct BlockRefTableWriter BlockRefTableWriter;
  * report_error_fn should not return.
  */
 typedef int (*io_callback_fn) (void *callback_arg, void *data, int length);
-typedef void (*report_error_fn) (void *calblack_arg, char *msg,...) pg_attribute_printf(2, 3);
+typedef void (*report_error_fn) (void *callback_arg, char *msg,...) pg_attribute_printf(2, 3);
 
 
 /*
diff --git a/src/include/nodes/pathnodes.h b/src/include/nodes/pathnodes.h
index b8141f141aa..91a6ce90d83 100644
--- a/src/include/nodes/pathnodes.h
+++ b/src/include/nodes/pathnodes.h
@@ -1867,7 +1867,7 @@ typedef struct ForeignPath
  *
  * We provide a set of hooks here - which the provider must take care to set
  * up correctly - to allow extensions to supply their own methods of scanning
- * a relation or joing relations.  For example, a provider might provide GPU
+ * a relation or join relations.  For example, a provider might provide GPU
  * acceleration, a cache-based scan, or some other kind of logic we haven't
  * dreamed up yet.
  *
diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h
index 247cecb4b45..43f5766d732 100644
--- a/src/include/nodes/primnodes.h
+++ b/src/include/nodes/primnodes.h
@@ -1641,7 +1641,7 @@ typedef struct JsonReturning
  *
  * The actual value is obtained by evaluating formatted_expr.  raw_expr is
  * only there for displaying the original user-written expression and is not
- * evaluated by ExecInterpExpr() and eval_const_exprs_mutator().
+ * evaluated by ExecInterpExpr() and eval_const_expressions_mutator().
  */
 typedef struct JsonValueExpr
 {
diff --git a/src/interfaces/libpq/t/005_negotiate_encryption.pl b/src/interfaces/libpq/t/005_negotiate_encryption.pl
index 1c37f832e76..03a9079f3fa 100644
--- a/src/interfaces/libpq/t/005_negotiate_encryption.pl
+++ b/src/interfaces/libpq/t/005_negotiate_encryption.pl
@@ -395,7 +395,7 @@ nogssuser   disable      disable      *              connect, authok
 	# The expected events and outcomes above assume that SSL support
 	# is enabled. When libpq is compiled without SSL support, all
 	# attempts to connect with sslmode=require or
-	# sslnegotition=direct/requiredirectwould fail immediately without
+	# sslnegotiation=direct/requiredirect would fail immediately without
 	# even connecting to the server. Skip those, because we tested
 	# them earlier already.
 	my ($sslmodes, $sslnegotiations);
@@ -552,7 +552,7 @@ done_testing();
 
 ### Helper functions
 
-# Test the cube of parameters: user, gssencmode, sslmode, and sslnegotitation
+# Test the cube of parameters: user, gssencmode, sslmode, and sslnegotiation
 sub test_matrix
 {
 	local $Test::Builder::Level = $Test::Builder::Level + 1;
diff --git a/src/test/authentication/t/006_login_trigger.pl b/src/test/authentication/t/006_login_trigger.pl
index 8229490ae27..30d852a96ad 100644
--- a/src/test/authentication/t/006_login_trigger.pl
+++ b/src/test/authentication/t/006_login_trigger.pl
@@ -143,7 +143,7 @@ psql_command(
 	log_exact => '2',
 	err_like => [qr/You are welcome/]);
 
-# Try to login as allowed Alice.  We don't check the Mallroy login, because
+# Try to login as allowed Alice.  We don't check the Mallory login, because
 # FATAL error could cause a timing-dependant panic of IPC::Run.
 psql_command(
 	$node, 'SELECT 1;', 0, 'try regress_alice',
diff --git a/src/test/modules/test_json_parser/t/004_test_parser_perf.pl b/src/test/modules/test_json_parser/t/004_test_parser_perf.pl
index c61fdf898a9..e82bb3695b8 100644
--- a/src/test/modules/test_json_parser/t/004_test_parser_perf.pl
+++ b/src/test/modules/test_json_parser/t/004_test_parser_perf.pl
@@ -4,7 +4,7 @@
 # Test the JSON parser performance tester. Here we are just checking that
 # the performance tester can run, both with the standard parser and the
 # incremental parser. An actual performance test will run with thousands
-# of iterations onstead of just one.
+# of iterations instead of just one.
 
 use strict;
 use warnings;
diff --git a/src/test/modules/worker_spi/t/001_worker_spi.pl b/src/test/modules/worker_spi/t/001_worker_spi.pl
index 177e1c6314f..fcd76b43e8e 100644
--- a/src/test/modules/worker_spi/t/001_worker_spi.pl
+++ b/src/test/modules/worker_spi/t/001_worker_spi.pl
@@ -115,7 +115,7 @@ my $noconndb_id = $node->safe_psql('mydb',
 my $log_offset = -s $node->logfile;
 
 # worker_spi_launch() may be able to detect that the worker has been
-# stopped, so do not rely on psql_safe().
+# stopped, so do not rely on safe_psql().
 $node->psql('postgres',
 	qq[SELECT worker_spi_launch(12, $noconndb_id, $myrole_id);]);
 $node->wait_for_log(
diff --git a/src/test/modules/worker_spi/worker_spi.c b/src/test/modules/worker_spi/worker_spi.c
index 22177cf2b59..7e1042f4ab6 100644
--- a/src/test/modules/worker_spi/worker_spi.c
+++ b/src/test/modules/worker_spi/worker_spi.c
@@ -384,7 +384,7 @@ _PG_init(void)
 	/*
 	 * Now fill in worker-specific data, and do the actual registrations.
 	 *
-	 * bgw_extra can optionally include a dabatase OID, a role OID and a set
+	 * bgw_extra can optionally include a database OID, a role OID and a set
 	 * of flags.  This is left empty here to fallback to the related GUCs at
 	 * startup (0 for the bgworker flags).
 	 */