Admiral of the Fleet Sir Algernon Usborne Willis GCB KBE DSO (17 May 1889 – 12 April 1976) was a Royal Navy officer.

He also served in the Second World War as Commander-in-Chief, South Atlantic in which capacity he led actions against German and Japanese raiding ships.

[7] Willis served in the Second World War initially on Cunningham's staff in which capacity, after promotion to rear admiral on 5 January 1940, he was involved in planning operations against the Regia Marina (Italian Navy).

[7] Appointed a Companion of the Order of the Bath on 11 July 1940,[8] he became Commander-in-Chief, South Atlantic with acting rank of vice-admiral in 1941 in which capacity he led actions against German and Japanese raiding ships.

[14][7] In this capacity he arranged the manpower for the campaign in the Pacific Ocean against the Imperial Japanese Navy, earning promotion to full admiral on 16 October 1945.

[18] Willis became Commander-in-Chief, Mediterranean Fleet in April 1946, in which role he was faced with unrest in Mandatory Palestine but rewarded with advancement to Knight Grand Cross of the Order of the Bath on 12 June 1947.

[19] Appointed a Knight of the Venerable Order of the Hospital of St John of Jerusalem on 5 January 1948,[20] he became Commander-in-Chief, Portsmouth in July 1948 and was promoted to Admiral of the Fleet on 20 March 1949[21] before retiring in 1950.