Lyall H. Powers (born July 13, 1924) is a professor of English at the University of Michigan, where he has taught since 1958. He was granted emeritus status by the University's Regents during their October, 1992, meeting.
Powers has written widely on modern American authors, and, with Leon Edel, edited the complete notebooks of Henry James. One of his most widely circulated books is Alien Heart, a biography of Canadian author Margaret Laurence. A lifelong friend of Laurence, having met her when they were students together in the 1940s, Powers combines personal knowledge of the author with a study of her writings.