Walter Terence Stace was a British civil servant, educator, public philosopher and epistemologist, who wrote on Hegel, mysticism, and moral relativism. He worked with the Ceylon Civil Service from 1910 to 1932, and from 1932 to 1955 he was employed by Princeton University in the Department of Philosophy. He is most renowned for his work in the philosophy of mysticism, and for books like Mysticism and Philosophy (1960) and Teachings of the Mystics (1960). These works have been influential in the study of mysticism, but they have also been severely criticised for their lack of methodological rigor and their perennialist pre-assumptions.

Moral relativism or ethical relativism is used to describe several philosophical positions concerned with the differences in moral judgments across different peoples and cultures. An advocate of such ideas is often referred to as a relativist.