Admiral Sir William Coldingham Masters Nicholson KCB (28 October 1863 – 9 January 1932) was a Royal Navy officer who went on to be Third Sea Lord and Controller of the Navy.
He was educated at Stubbington House School. He served in World War I and, as Captain of HMS Canada, saw action at the Battle of Jutland in 1916. He went on to be Rear Admiral (i.e. Second of Command) of the 1st Battle Squadron later that year.
He was appointed Third Sea Lord and Controller of the Navy in 1919 and was given command of the 2nd Battle Squadron in October 1920. He then became Commander of the 1st Battle Squadron in May 1921.
He lived at Winchcombe in Gloucestershire.