Ralph Charles Sutherland Walker (born 2 June 1944) is a philosopher at Magdalen College, Oxford and an expert on the philosophy of Immanuel Kant.

[3] Roger Scruton called Walker's book Kant "clear and scholarly" and the “‘positive’ rejoinder" to the “‘objective’ interpretation" of Kant's Critique of Pure Reason, The Bounds of Sense, by P. F. Strawson,[4] who had already been at Magdalen when Walker started his work there and remained a fellow until 1987.

Walker's later book, Kant and the Moral Law, was released in 1998 and has been translated into a number of languages.

His most recent work, Objective Imperatives: An Exploration of Kant's Moral Philosophy, was published in 2022.

Journal articles and papers by Ralph Walker can be found at JSTOR and philpapers.