The Department of the Director of Underwater Weapons Materials[1] originally known as the Torpedo Department was a former department of the British Department of Admiralty from 1917 to 1958 when it became the Underwater Weapons Division of the Weapons Department.

[2] During the First World War in April 1917 the Torpedo Department of the Naval Ordnance Department was made a separate department in its own right this became known as the Department of the Director of Torpedoes and Mining.

Following World War Two in 1946 it was renamed the Department of the Director of Underwater Weapons until October 1956 when it was renamed the Department of the Director of Underwater Weapons Materials.

In 1958 the Naval Ordnance Department and this department became divisions of the new Weapons Department.

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