Walter A. Mayer (July 8, 1890 – November 18, 1951) was a backup catcher in Major League Baseball who played from 1911 through 1919 for the Chicago White Sox (1911–1912, 1914–1915), Boston Red Sox (1917–1918) and St. Louis Browns (1919). Listed at 5 ft 11 in (1.80 m), 168 lb., Mayer batted and threw right-handed. He was born in Cincinnati. Mayer died in Minnetonka, Minnesota at age 61.