Admiral Sir Frank Roddam Twiss, KCB, KCVO, DSC (7 July 1910 – 27 January 1994)[1] was a senior Royal Navy officer who served as Second Sea Lord and Chief of Naval Personnel from 1967 to 1970.

The son of Lieutenant Colonel Edward Twiss and his first wife Margaret Edmondson née Tate, he joined the Royal Navy as a cadet in 1924.

[2] Lord Carrington, who had been First Lord of the Admiralty when Twiss was Naval Secretary, later said: The Naval Secretary was an officer destined to get to the very top—detailed for two years or so to look after promotion to Captain and Flag rank in the Royal Navy and, in the course of doing so, to look after a civilian First Lord, almost invariably ignorant of naval tradition and likely, particularly when visiting the Fleet, to make mistakes of so fundamental and tasteless a character that it would call into question not just the credibility of the Government but our political institutions.

He did indeed rise to the top of the Royal Navy, despite an occasion which I remember when cruising with him in HMS Tiger.

[2] In retirement, Twiss served as Gentleman Usher of the Black Rod from 1970 to 1978 and was a member of Commonwealth War Graves Commission from 1970 to 1979.