Sir William Courtenay, 2nd Baronet (11 March 1676 – 6 October 1735) of Powderham Castle, Powderham, Devon, was an English landowner, a leading member of the Devonshire gentry and Tory politician who sat in the English House of Commons from 1701 to 1707 and in the British House of Commons almost continually from 1707 to 1735.