diff --git a/changelog.d/17799.misc b/changelog.d/17799.misc
new file mode 100644
index 0000000000..99022f4f53
--- /dev/null
+++ b/changelog.d/17799.misc
@@ -0,0 +1 @@
+Add missing license headers on new source files.
diff --git a/synapse/app/generic_worker.py b/synapse/app/generic_worker.py
index 6a944998f1..a528c3890d 100644
--- a/synapse/app/generic_worker.py
+++ b/synapse/app/generic_worker.py
@@ -3,7 +3,7 @@
#
# Copyright 2020 The Matrix.org Foundation C.I.C.
# Copyright 2016 OpenMarket Ltd
-# Copyright (C) 2023 New Vector, Ltd
+# Copyright (C) 2023-2024 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
diff --git a/synapse/handlers/delayed_events.py b/synapse/handlers/delayed_events.py
index 9d59a09948..3c88a96fd3 100644
--- a/synapse/handlers/delayed_events.py
+++ b/synapse/handlers/delayed_events.py
@@ -1,3 +1,17 @@
+#
+# This file is licensed under the Affero General Public License (AGPL) version 3.
+#
+# Copyright (C) 2024 New Vector, Ltd
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# See the GNU Affero General Public License for more details:
+# <https://www.gnu.org/licenses/agpl-3.0.html>.
+#
+
import logging
from typing import TYPE_CHECKING, List, Optional, Set, Tuple
diff --git a/synapse/replication/http/__init__.py b/synapse/replication/http/__init__.py
index 1673bd057e..d500051714 100644
--- a/synapse/replication/http/__init__.py
+++ b/synapse/replication/http/__init__.py
@@ -1,7 +1,7 @@
#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
-# Copyright (C) 2023 New Vector, Ltd
+# Copyright (C) 2023-2024 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
diff --git a/synapse/replication/http/delayed_events.py b/synapse/replication/http/delayed_events.py
index 77dabb08e6..229022070c 100644
--- a/synapse/replication/http/delayed_events.py
+++ b/synapse/replication/http/delayed_events.py
@@ -1,3 +1,17 @@
+#
+# This file is licensed under the Affero General Public License (AGPL) version 3.
+#
+# Copyright (C) 2024 New Vector, Ltd
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# See the GNU Affero General Public License for more details:
+# <https://www.gnu.org/licenses/agpl-3.0.html>.
+#
+
import logging
from typing import TYPE_CHECKING, Dict, Optional, Tuple
diff --git a/synapse/rest/client/delayed_events.py b/synapse/rest/client/delayed_events.py
index eae5c9d226..2dd5a60b2b 100644
--- a/synapse/rest/client/delayed_events.py
+++ b/synapse/rest/client/delayed_events.py
@@ -1,3 +1,17 @@
+#
+# This file is licensed under the Affero General Public License (AGPL) version 3.
+#
+# Copyright (C) 2024 New Vector, Ltd
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# See the GNU Affero General Public License for more details:
+# <https://www.gnu.org/licenses/agpl-3.0.html>.
+#
+
# This module contains REST servlets to do with delayed events: /delayed_events/<paths>
import logging
diff --git a/synapse/storage/databases/main/delayed_events.py b/synapse/storage/databases/main/delayed_events.py
index 1a7781713f..1616e30e22 100644
--- a/synapse/storage/databases/main/delayed_events.py
+++ b/synapse/storage/databases/main/delayed_events.py
@@ -1,3 +1,17 @@
+#
+# This file is licensed under the Affero General Public License (AGPL) version 3.
+#
+# Copyright (C) 2024 New Vector, Ltd
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# See the GNU Affero General Public License for more details:
+# <https://www.gnu.org/licenses/agpl-3.0.html>.
+#
+
import logging
from typing import List, NewType, Optional, Tuple
diff --git a/synapse/storage/schema/main/delta/88/01_add_delayed_events.sql b/synapse/storage/schema/main/delta/88/01_add_delayed_events.sql
index 55bfbc8ae7..78ba5129af 100644
--- a/synapse/storage/schema/main/delta/88/01_add_delayed_events.sql
+++ b/synapse/storage/schema/main/delta/88/01_add_delayed_events.sql
@@ -1,3 +1,16 @@
+--
+-- This file is licensed under the Affero General Public License (AGPL) version 3.
+--
+-- Copyright (C) 2024 New Vector, Ltd
+--
+-- This program is free software: you can redistribute it and/or modify
+-- it under the terms of the GNU Affero General Public License as
+-- published by the Free Software Foundation, either version 3 of the
+-- License, or (at your option) any later version.
+--
+-- See the GNU Affero General Public License for more details:
+-- <https://www.gnu.org/licenses/agpl-3.0.html>.
+
CREATE TABLE delayed_events (
delay_id TEXT NOT NULL,
user_localpart TEXT NOT NULL,
diff --git a/tests/rest/client/test_delayed_events.py b/tests/rest/client/test_delayed_events.py
index cb77c73da2..1793b38c4a 100644
--- a/tests/rest/client/test_delayed_events.py
+++ b/tests/rest/client/test_delayed_events.py
@@ -1,3 +1,17 @@
+#
+# This file is licensed under the Affero General Public License (AGPL) version 3.
+#
+# Copyright (C) 2024 New Vector, Ltd
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# See the GNU Affero General Public License for more details:
+# <https://www.gnu.org/licenses/agpl-3.0.html>.
+#
+
"""Tests REST events for /delayed_events paths."""
from http import HTTPStatus
diff --git a/tests/rest/client/test_rooms.py b/tests/rest/client/test_rooms.py
index 00be0051c6..2ecd37ca1a 100644
--- a/tests/rest/client/test_rooms.py
+++ b/tests/rest/client/test_rooms.py
@@ -4,7 +4,7 @@
# Copyright 2019 The Matrix.org Foundation C.I.C.
# Copyright 2017 Vector Creations Ltd
# Copyright 2014-2016 OpenMarket Ltd
-# Copyright (C) 2023 New Vector, Ltd
+# Copyright (C) 2023-2024 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
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