|Formed||8 January 1912|
|Dissolved||12 January 1918|
|Parent department||Department of Admiralty|
The Mobilisation Division  was a staff division of the Admiralty War Staff, then later Admiralty Naval Staff responsible for mobilisation requirements, manning and war preparation planning from 1912-1918.
The Mobilisation Division was established on 8 January 1912  it evolved out of the Naval Mobilisation Department of the Admiralty and was part of both the Admiralty War Staff and Admiralty Naval Staff departments. Mobilisation ceased to be a Naval Staff division on 12 January 1918  when it was re-designated an admiralty department that would now report to the Office of the Second Sea Lord until 1932.
The division was responsible for the mobilisation of active personnel, in addition to securing crews for all commissioned vessels including those in reserve. It also had to plan for and arrange the requisition of merchant vessels for the purpose of auxiliary purposes. It was also responsible for liaising with various mobilisation (naval employment offices) present all ports to process drafted conscripts. Other duties included the planning and projecting all manning requirements and securing available resources to meet those plans. During world war one in addition to its other duties, the Mobilisation Division was also charged with the responsibility for the supplying the fleet with fuel, from the Naval War Staff point of view.
Director of Mobilisation Division
- Rear-Admiral Alexander Ludovic Duff, October 1912-October 1914.
- Captain Hugh F, P. Sinclair, October 1914-June 1916.
- Rear-Admiral Sir Michael Culme-Seymour, 3rd Baronet, June 1916-September 1918.
As of 1917:
- All points connected with mobilisation which are dealt with by members of the Board, are in the first instance to be referred to them for their consideration.
- To prepare and keep correct to date, a complete all plans for mobilising the Naval forces of the Empire with the utmost possible rapidity, and with the least strain on the Admiralty.
- To keep Commanders-in-Chief and Commanding Officers supplied, as may be directed, with all such important information as shall be considered by the Board likely to be of use in war.
Assistant Director of Mobilisation Division
- Captain John W. L. McClintock, January 1912 - April 1914.
- Captain Geoffrey Hopwood, May 1914 - April 1916.
Division Sub Sections
A more detailed breakdown of the distribution of work allocated within the division to the various staff sections can be seen below.
As of 1917:
|HMOD||18 (III.)||The head of sub-division is responsible for general superintendence of work of Mobilisation Sections.|
|MO1||19 (III.)||Admiralty Representative on Navy Employment Agency, Control of all rail and road traffic in time of War, Mobilisation arrangements as regards Personnel of Fleet, Mobilisation questions raised by the Mobilising Committees at the Ports, Preparation for Peace Manœuvres.|
|MO2||19 (III.)||Preparation of Monthly Mobilising List of Officers.|
|HMAD||32 (III.)||The head of sub-division is responsible for general superintendence of work of Manning Sections,|
|MA3||31 (III.)||Manning requirements and resources, Secure and make ready arrangements for War Staff.|
|MA4||31 (III.)||Preparation of reports on the number of officers and men available for manning.|
- Lambert, Nicholas A. (2002). Sir John Fisher's Naval Revolution:Abbreviations. Univ of South Carolina Press. p. XV. ISBN 9781570034923.
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- Archives, The National. "Duff Service Record". discovery.nationalarchives.gov.uk. National Archives, ADM 196/43, f80. Retrieved 22 February 2017.
- Archives, The National. "Sinclair Service Record". discovery.nationalarchives.gov.uk. National Archives, ADM 196/43, f368. Retrieved 22 February 2017.
- Archives, The National. "Culme-Seymour Service Record". discovery.nationalarchives.gov.uk. National Archives, ADM 196/43, f477. Retrieved 22 February 2017.
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- Marder, Arthur J. (31 March 2014). From the Dreadnought to Scapa Flow: Volume IV 1917, Year of Crisis. Seaforth Publishing. p. 222. ISBN 9781848322011.