Robert McAfee Brown (May 28, 1920 Carthage, Illinois – September 4, 2001 Greenfield, Massachusetts) was a Presbyterian minister, a theologian, and an activist.
Brown was the son of a Presbyterian minister and the grandson of theologian and Presbyterian minister Cleland Boyd McAfee. He earned a bachelor's degree from Amherst College in 1943 and was ordained a Presbyterian minister in 1944. Brown earned a Bachelor of Divinity degree from Union Theological Seminary in 1945, and served as a United States Navy chaplain from 1945 to 1946. The recipient of a Fulbright grant, Brown studied at the University of Oxford before completing a doctorate in the philosophy of religion at Columbia University in 1951. He married Sydney Thomson, and had four children.
Initially, Brown taught at his alma mater, Union Theological Seminary, before accepting an appointment as Professor of Religion at Stanford University in 1962. There he became an international leader in civil rights, ecumenical and social justice causes. Brown campaigned against U.S. involvement in the Vietnam War and was a co-founder of the group "Clergy and Laity Concerned about Vietnam". He was also a Protestant observer at the Second Vatican Council.