Charles A. Armbruster (August 30, 1880 – October 7, 1964) was a backup catcher in Major League Baseball who played from 1905 through 1907 for the Boston Americans and the Chicago White Sox.

A native of Cincinnati, Ohio,[1] Ambruster shared catching duties with Lou Criger for the Boston Americans in part of three seasons.

In a three-year career, Ambruster was a .149 hitter (53-for-355) with 24 runs and 12 RBI in 131 games.

Ambruster died in Grants Pass, Oregon at the age of 84.

This biographical article relating to an American baseball catcher born in the 1880s is a stub.