diff --git a/gio/gappinfo.c b/gio/gappinfo.c
index 42feb9d7c..787b77451 100644
--- a/gio/gappinfo.c
+++ b/gio/gappinfo.c
@@ -1595,7 +1595,7 @@ g_app_launch_context_get_display (GAppLaunchContext *context,
  * g_app_launch_context_get_startup_notify_id:
  * @context: a #GAppLaunchContext
  * @info: a #GAppInfo
- * @files: (element-type GFile): a #GList of of #GFile objects
+ * @files: (element-type GFile): a #GList of #GFile objects
  * 
  * Initiates startup notification for the application and returns the
  * `XDG_ACTIVATION_TOKEN` or `DESKTOP_STARTUP_ID` for the launched operation,
diff --git a/gio/gapplication.c b/gio/gapplication.c
index 200799d53..31508ebbe 100644
--- a/gio/gapplication.c
+++ b/gio/gapplication.c
@@ -88,8 +88,8 @@
  * instance and g_application_run() promptly returns. See the code
  * examples below.
  *
- * If used, the expected form of an application identifier is the same as
- * that of of a
+ * If used, the expected form of an application identifier is the 
+ * same as that of a
  * [D-Bus well-known bus name](https://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-names-bus).
  * Examples include: `com.example.MyApp`, `org.example.internal_apps.Calculator`,
  * `org._7_zip.Archiver`.
diff --git a/gio/gdbusintrospection.c b/gio/gdbusintrospection.c
index a08c1298c..c7be334ce 100644
--- a/gio/gdbusintrospection.c
+++ b/gio/gdbusintrospection.c
@@ -1613,7 +1613,7 @@ parser_end_element (GMarkupParseContext  *context,
       nodes = parse_data_steal_nodes (data, &num_nodes);
       interfaces = parse_data_steal_interfaces (data, &num_interfaces);
 
-      /* destroy the nodes, interfaces for scope we're exiting and and pop the nodes, interfaces from the
+      /* destroy the nodes, interfaces for scope we're exiting and pop the nodes, interfaces from the
        * scope we're reentering
        */
       parse_data_free_interfaces (data);
@@ -1707,7 +1707,7 @@ parser_end_element (GMarkupParseContext  *context,
 
       embedded_annotations = steal_annotations (data);
 
-      /* destroy the annotations for scope we're exiting and and pop the annotations from the scope we're reentering */
+      /* destroy the annotations for scope we're exiting and pop the annotations from the scope we're reentering */
       parse_data_free_annotations (data);
       data->annotations = (GPtrArray *) data->annotations_stack->data;
       data->annotations_stack = g_slist_remove (data->annotations_stack, data->annotations_stack->data);
@@ -1727,7 +1727,7 @@ parser_end_element (GMarkupParseContext  *context,
 
   if (!have_popped_annotations)
     {
-      /* destroy the annotations for scope we're exiting and and pop the annotations from the scope we're reentering */
+      /* destroy the annotations for scope we're exiting and pop the annotations from the scope we're reentering */
       parse_data_free_annotations (data);
       data->annotations = (GPtrArray *) data->annotations_stack->data;
       data->annotations_stack = g_slist_remove (data->annotations_stack, data->annotations_stack->data);
diff --git a/gio/gschema.dtd b/gio/gschema.dtd
index 3a903e7ab..9d7482db7 100644
--- a/gio/gschema.dtd
+++ b/gio/gschema.dtd
@@ -33,7 +33,7 @@
               enum  CDATA #IMPLIED
               flags CDATA #IMPLIED >
 
-<!-- the default value is specified a a serialized GVariant,
+<!-- the default value is specified as a serialized GVariant,
      i.e. you have to include the quotes when specifying a string -->
 <!ELEMENT default (#PCDATA) >
 <!-- the presence of the l10n attribute marks a default value for
diff --git a/gio/gtlsdatabase.c b/gio/gtlsdatabase.c
index 40d1ab63f..4966aadd0 100644
--- a/gio/gtlsdatabase.c
+++ b/gio/gtlsdatabase.c
@@ -978,7 +978,7 @@ g_tls_database_lookup_certificates_issued_by (GTlsDatabase           *self,
  * g_tls_database_lookup_certificates_issued_by() for more information.
  *
  * The database may choose to hold a reference to the issuer byte array for the duration
- * of of this asynchronous operation. The byte array should not be modified during
+ * of this asynchronous operation. The byte array should not be modified during
  * this time.
  *
  * Since: 2.30
diff --git a/glib/tests/gvariant.c b/glib/tests/gvariant.c
index 98c51a1d7..c8f13360c 100644
--- a/glib/tests/gvariant.c
+++ b/glib/tests/gvariant.c
@@ -3807,7 +3807,7 @@ test_gv_byteswap (void)
 # define native16(x)  0, x
 # define swapped16(x) x, 0
 #endif
-  /* all kinds of of crazy randomised testing already performed on the
+  /* all kinds of crazy randomised testing already performed on the
    * byteswapper in the /gvariant/serializer/byteswap test and all kinds
    * of crazy randomised testing performed against the serializer
    * normalisation functions in the /gvariant/serializer/fuzz/ tests.
diff --git a/glib/win_iconv.c b/glib/win_iconv.c
index 7c78e78fc..8635c37e3 100644
--- a/glib/win_iconv.c
+++ b/glib/win_iconv.c
@@ -1087,7 +1087,7 @@ ucs4_to_utf16(uint wc, ushort *wbuf, int *wbufsize)
 /*
  * Check if codepage is one of those for which the dwFlags parameter
  * to MultiByteToWideChar() must be zero. Return zero or
- * MB_ERR_INVALID_CHARS.  The docs in Platform SDK for for Windows
+ * MB_ERR_INVALID_CHARS.  The docs in Platform SDK for Windows
  * Server 2003 R2 claims that also codepage 65001 is one of these, but
  * that doesn't seem to be the case. The MSDN docs for MSVS2008 leave
  * out 65001 (UTF-8), and that indeed seems to be the case on XP, it