Marvin Howard "Baby Face" Breuer (April 29, 1914 – January 17, 1991) was a pitcher in Major League Baseball. He played for the New York Yankees from 1939 to 1943.
In the 1941 World Series, Breuer came on as a reliever in the fifth inning of Game 4 to relieve Atley Donald, with the Yankees losing 4-3. Breuer pitched three scoreless innings, which enabled the Yankees to ultimately win the game on a passed ball by Mickey Owen Breuer also pitched in the 1942 World Series, which the Yankees lost to the St. Louis Cardinals.
After Breuer's playing career ended, he spent 31 years working for the United States Geological Survey until his retirement in 1976. He was survived by his wife, Dorothy, two children, three grandchildren, and three great grandchildren.