William Darrah Kelley (April 12, 1814 – January 9, 1890) was a Republican member of the U.S. House of Representatives from Pennsylvania. As an abolitionist, he was one of the founders of the Republican Party in 1854, and a friend of Abraham Lincoln. Kelley was a man of strict principles, advocating the recruitment of black troops in the civil war, and the extending of the vote to them afterwards.