William Paton Ker (usually referred to as W. P. Ker) was a Scottish literary scholar and essayist.
He was appointed to a fellowship at All Souls College, Oxford in 1879, became Professor of English Literature and History at the University College of South Wales, Cardiff in 1883; and moved to University College London as Quain Professor in 1889. He was the Oxford Professor of Poetry from 1920 to his death.