Vice-Admiral Sir William Fane De Salis, KBE, MVO, JP (21 July 1858 – 23 January 1939), was a Royal Navy admiral during the early years of the First World War.
de Salis entered the Royal Navy, HMS Britannia, in 1871; and served in the Niger (1886) and the Ogaden Somali expeditions (1901). After promotion to captain on 30 June 1901, he was on 5 September 1902 appointed in command of the ironclad HMS Orion, depot-ship for at Malta for torpedo-boats in the Mediterranean Fleet.
He was naval ADC to Kings Edward VII and George V, 1909-1910, was promoted to rear-admiral in 1911, and retired from the navy in 1913. He served as a captain in the Royal Naval Reserve's Yacht Patrol, 6 March 1915 – 1916; Vice-Admiral, Head of Mission to Portugal, 9 June 1916. He served on the following: HMS Russell; HMS Jupiter; HMS Revenge; HMS Gladiator; HMS Blake; HMS Juno; HMS Mersey; HMS Scout; HMS Haughty; and HMTB 87.
de Salis was appointed a Member of the Royal Victorian Order in 1904, and knighted as a Knight Commander of the Order of the British Empire in 1922. He received the Prussian Order of the Red Eagle in 1904 (2 class) and the Portuguese Order of the Tower and Sword in 1916. He was Justice of the peace (JP) of Hampshire from 1904.