John Bernard McDowell (July 17, 1921 – February 25, 2010) was an American prelate of the Roman Catholic Church who served as auxiliary bishop of the Diocese of Pittsburgh in Pennsylvania from 1966 to 1996.

McDowell was ordained to the priesthood on November 4, 1945.

He was consecrated by Cardinal John Joseph Wright on September 8, 1966.

Auxiliary Bishop McDowell ordained the future Cardinal Archbishop of Boston, Seán Patrick O'Malley, O.F.M.

This article about an American Catholic bishop or archbishop is a stub.