William Darrah Kelley (April 12, 1814 – January 9, 1890) was an American politician from Philadelphia who served as a Republican member of the U.S. House of Representatives for Pennsylvania's 4th congressional district from 1861 to 1890. He was an abolitionist, a friend of Abraham Lincoln and one of the founders of the Republican Party in 1854. He advocated for the recruitment of black troops in the American Civil War, and the extension of voting rights to them afterwards. His belief in protective tariffs was so extreme that he refused to wear a single imported garment.