Vice Admiral Sir Horace Collier Lyddon KBE CB (28 September 1912 – 9 June 1968) was a Royal Navy officer who became President of the Royal Naval College, Greenwich.

[1] Lyddon joined the Royal Navy in 1930 and served in World War II as Deputy Secretary to the Commander-in-Chief, Eastern Fleet from 1942 until 1944 when he became Secretary to the Commander, 5th Cruiser Squadron.

[2] He went on to be Executive Assistant to the Deputy Supreme Allied Commander Atlantic in 1954, Commanding Officer of the shore establishment HMS Phoenicia in 1958 and Director of Service Conditions at the British Admiralty in 1960.

Promoted to vice admiral on 9 February 1966,[3] he served as President of the Royal Naval College, Greenwich from 1967 until his death in 1968.

Lyddon served as president of the Royal Navy Rugby Union in 1967 and also served as naval member of the Rugby Football Union.