John Brooke Mosley Jr. (October 18, 1915 – March 4, 1988) was bishop of the Episcopal Diocese of Delaware, serving as diocesan from 1955 to 1968.

In 1944, he became director of the Department of Social Relations of the Diocese of Washington, while in 1948 he was appointed Dean of St John's Cathedral in Wilmington, Delaware, where he remained till 1953.

He then served as president of Union Theological Seminary from 1970 to 1974, where he strove to increase the student body with minority people and women.

He died of a heart attack in Pennsylvania Station, New York City whilst boarding a train for Philadelphia, on March 4, 1988.

[4] He married Betty Mary Wall at St. Thomas Church, Whitemarsh, Fort Washington, PA, on 6 June 1942.