Sir William Cecil Dampier FRS (born William Cecil Dampier Whetham) (27 December 1867 – 11 December 1952) was a British scientist, agriculturist, and science historian who developed a method of extracting lactose (milk sugar) from whey.
He was born in London, the son of Charles Langley and Mary (née Dampier) Whetham and the grandson of Sir Charles Whetham, a former Lord Mayor of London. In 1886, he entered Trinity College, Cambridge and in 1889 commenced his varied researches in the Cavendish Laboratory. In 1891 was elected a Fellow of Trinity.