Sir William Robert Campion, KCMG, DSO, TD, DL (3 July 1870 – 2 January 1951) was a British soldier, politician, and the 21st Governor of Western Australia from 1924 to 1931.

Born in London, England on 3 July 1870, Campion was educated at Eton College and the University of Oxford, and was the Conservative MP for Lewes from 1910 to 1924.

The 1/4th Sussex advanced steadily in extended order, found the Queen's who had been driven off the crest, and consolidated a line, having suffered heavy casualties.

From October 1924 to June 1931 Campion worked with Labor and Nationalist premiers alike in harmony during a period without major political crises.

Campion returned to England in 1931 and retired to his country house in Sussex, but spoke frequently in favour of organized migration to Australia.