Wellington Bartley Willoughby, PC (August 10, 1859 – August 1, 1932) was a Canadian politician and lawyer. He ran for a seat in the Dominion House of Commons for the Conservative Party in the 1895 election, but an unofficial Tory, William Stubbs backed by the Orange Order such as its Grand Master and McCarthyite leader Dalton McCarthy undermined his campaign, though he was also an Orangeman. Willoughby served as leader of the Saskatchewan Conservative Party and leader of the opposition from 1912 to 1917 and was Member of the Legislative Assembly of Saskatchewan (MLA) for the city of Moose Jaw.