Sir William Blaxland Benham KBE FRS (29 March 1860 – 21 August 1950) was a New Zealand zoologist.
He was born in Isleworth, Middlesex, England on 29 March 1860. He studied at Marlborough College and London University and taught before moving to New Zealand in 1898. He was a member of the 1907 Sub-Antarctic Islands Scientific Expedition.
He retired in 1936 and was made a Knight Commander of the Order of the British Empire in the 1939 Birthday Honours.