John Thomas Walker (July 27, 1925 – September 30, 1989) was Bishop of Washington from 1977 to 1989 in the Episcopal Diocese of Washington. From 1978 to 1989, he also served as Dean of Washington National Cathedral. Previously, he served as Bishop Coadjutor from 1976 to 1977 and Bishop Suffragan from 1971 to 1976. He was the first African-American Bishop of Washington.