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.

Wally Mayer
Catcher
Born: (1890-07-08)July 8, 1890 Cincinnati, Ohio
Died: November 18, 1951(1951-11-18) (aged 61) Minnetonka, Minnesota
Batted: Right Threw: Right
MLB debut
September 28, 1911, for the Chicago White Sox
Last MLB appearance
September 2, 1919, for the St. Louis Browns
MLB statistics
Batting average	.193
Home runs	0
Runs batted in	20
Teams
Chicago White Sox (1911–1912, 1914–1915) Boston Red Sox (1917–1918) St. Louis Browns (1919)
Career highlights and awards
World Series champion (1918)

In a seven-season career, Mayer was a .193 hitter (53-for-274) with 22 runs and 20 RBI in 132 games, including 14 doubles, one triple, one stolen base, and a .303 on-base percentage. He did not hit a home run. In 112 catching appearances, he committed 17 errors in 553 chances for a .968 fielding percentage.

Mayer died in Minnetonka, Minnesota at age 61.