The Signal Division [1] was a Directorate of the Admiralty Naval Staff responsible for policy, control and management of all naval communications from 1914 to 1964.

In 1906 the Admiralty set up a Signals Committee to initially investigate signaling between Royal Navy vessels and Merchant Navy vessels,[2] in 1914 the Admiralty War Staff had established an expanded Signal Section [3] to deal with all shore to ship communications following the abolition of the war staff function.

The Signal Division was established on the 18 August 1917 [4] the divisions primary role was for receiving and sending signals to ships at sea and stations ashore, but also for the coding or cyphering of the signals.

In September 1919 the division was renamed the Communications Division [5] until 1927 when it was again re-styled Signal Section still within the Naval Staff until 1941 when it reverted to Signal Division, it continued as a component part of the Naval Staff until 1964 when the Admiralty Department was abolished and replaced by a new Navy Department within the Ministry of Defence.

As of August, 1917:[6] Included:[7] Included:[8] Primary source for this article is by Harley Simon, Lovell Tony, (2017), Signal Division (Royal Navy), dreadnoughtproject.org, http://www.dreadnoughtproject.org.