Deputy First Sea Lord
The Deputy First Sea Lord (D.F.S.L.) was a senior Royal Navy flag officer on the Board of Admiralty of the Royal Navy.
| Office of the Deputy First Sea Lord | |
|---|---|
| Ensign of the Royal Navy | |
| Department of the Admiralty | |
| Member of | Board of Admiralty | 
| Reports to | First Sea Lord | 
| Nominator | First Lord of the Admiralty | 
| Appointer | Prime Minister Subject to formal approval by the King-in-Council | 
| Term length | 1-4 years | 
| Inaugural holder | Rosslyn E. Wemyss | 
| Formation | 1917-1919, 1942-1946 |