Commodore Frederick Dean (19001983) was a South African military commander.
Military career
During World War I, he served with the Mercantile Marine, attached to the Royal Navy. He became a sub-lieutenant in the RNR and served in submarines. He joined the South African arm of the as a lieutenant.
In 1940, he became Officer Commanding of , sweeping the Agulhas Bank, which earned him an OBE.
From 1942, he was Commanding Officer, Cape Town Detachment, Seaward Defence Force.
In 1945, he became Commander Seaward Defences, South African Naval Forces, effectively the head of the South African Navy.
Later career
He was a trustee of the National War Museum from 1946 to 1952.