Henry Gregory "Harry" Armbruster (March 20, 1882 – December 10, 1953), also known as "Army" Armbruster, was an American professional baseball player whose career spanned 10 seasons, including one in Major League Baseball. During that one season, which was in 1906, Armbruster played with the Philadelphia Athletics. Armbruster, an outfielder, compiled a major league batting average of .238 with 40 runs, 63 hits, six doubles, three triples, two home runs, 24 runs batted in (RBIs) and 13 stolen bases in 91 games played. Armbruster also played in the minor leagues with the Class-A Providence Grays; the Class-B Manchester, New Hampshire baseball team; the Class-B Lawrence Colts; the Class-A Toledo Mud Hens; the Class-A St. Paul Saints; and the Class-B Syracuse Stars. In the minors, Armbruster compiled a batting average .292 with 1,159 hits in 1,101 games played.