diff --git a/synapse/handlers/device.py b/synapse/handlers/device.py
index 0b4cd53456dd41e25dbf649413be9f67ab297f51..2d44f15da3069a3673e210cf8c955619956c0798 100644
--- a/synapse/handlers/device.py
+++ b/synapse/handlers/device.py
@@ -539,7 +539,7 @@ class DeviceListEduUpdater(object):
                 yield self.device_handler.notify_device_update(user_id, device_ids)
             else:
                 # Simply update the single device, since we know that is the only
-                # change (becuase of the single prev_id matching the current cache)
+                # change (because of the single prev_id matching the current cache)
                 for device_id, stream_id, prev_ids, content in pending_updates:
                     yield self.store.update_remote_device_list_cache_entry(
                         user_id, device_id, content, stream_id,
diff --git a/synapse/handlers/message.py b/synapse/handlers/message.py
index f27f4d35469291a3ccd75498b88f352850a234af..a39b852cebfcac6c75d62980574bb63ff74e622b 100644
--- a/synapse/handlers/message.py
+++ b/synapse/handlers/message.py
@@ -384,7 +384,7 @@ class MessageHandler(BaseHandler):
         users_with_profile = yield self.state.get_current_user_in_room(room_id)
 
         # If this is an AS, double check that they are allowed to see the members.
-        # This can either be because the AS user is in the room or becuase there
+        # This can either be because the AS user is in the room or because there
         # is a user in the room that the AS is "interested in"
         if requester.app_service and user_id not in users_with_profile:
             for uid in users_with_profile:
diff --git a/synapse/storage/user_directory.py b/synapse/storage/user_directory.py
index ce59e70d0ef094a9250f207338db0f16c0ec052f..a8781b0e5d5b1e3e36fb67c82475d9f784dcf5da 100644
--- a/synapse/storage/user_directory.py
+++ b/synapse/storage/user_directory.py
@@ -265,7 +265,7 @@ class UserDirectoryStore(SQLBaseStore):
         self.get_user_in_public_room.invalidate((user_id,))
 
     def get_users_in_public_due_to_room(self, room_id):
-        """Get all user_ids that are in the room directory becuase they're
+        """Get all user_ids that are in the room directory because they're
         in the given room_id
         """
         return self._simple_select_onecol(
@@ -277,7 +277,7 @@ class UserDirectoryStore(SQLBaseStore):
 
     @defer.inlineCallbacks
     def get_users_in_dir_due_to_room(self, room_id):
-        """Get all user_ids that are in the room directory becuase they're
+        """Get all user_ids that are in the room directory because they're
         in the given room_id
         """
         user_ids_dir = yield self._simple_select_onecol(