John Wilfred Mullen (September 30, 1924 – April 3, 1991) was an American Major League Baseball executive from 1947 to 1991 with the Boston / Milwaukee / Atlanta Braves and the Houston Astros.
Born in Calais, Maine, Mullen served as the farm system director and head of minor league operations with the Milwaukee/Atlanta Braves from 1960 to 1966.
He served as acting general manager from July 10 to August 7, 1975, when Tal Smith assumed the permanent GM role.
Led by sluggers Dale Murphy and Bob Horner, the Braves won the 1982 National League West Division championship during Mullen's tenure in this position.
John Mullen died at age 66 in West Palm Beach, Florida, on Wednesday, April 3, 1991, having been found dead in his hotel room that morning.