William Ridley (22 July 1836 – 25 May 1911) was an English missionary for the Church of England in Canada and served as Bishop of Caledonia.

He was a carpenter before attending the Church Missionary Society's Islington Training School and being sent, in 1866, to missionize among Afghans in what was then the province of Peshawar in India.

In 1879, Ridley was appointed Bishop of the newly created Diocese of Caledonia in northern British Columbia; he was consecrated a bishop, by Archibald Campbell Tait, Archbishop of Canterbury, on 25 July at St Paul's Cathedral;[1] and he and his wife Jane set out for Canada.

His appointment involved ensuring that missions under the Church Missionary Society (CMS) adhered to Anglican doctrine.

In particular, Duncan refused to offer his parishioners holy communion on the grounds that it would whet their appetite for recently abandoned "cannibalistic" practices.