William S. Thomas Jr. (November 21, 1901 – April 19, 1986) was suffragan bishop of the Episcopal Diocese of Pittsburgh, serving from 1953 to 1971.
He was educated at the Washington & Jefferson College in Pennsylvania between 1921 and 1922 and then at the University of Pittsburgh from where he graduated with a Bachelor of Arts in 1924.
Thomas was ordained deacon in December 1926 and priest in July 1927, both by Bishop Alexander Mann.
He was elected Suffragan Bishop of Pittsburgh during a special diocesan convention that took place in Trinity Cathedral on July 1, 1953. he was then consecrated on September 29, 1953, by Bishop Austin Pardue of Pittsburgh.
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