John Helm Grim (August 9, 1867 – July 28, 1961) was an American catcher in Major League Baseball (MLB).

Although he played in two games for the 1888 Philadelphia Quakers, his MLB career really started when he joined the Rochester Broncos of the American Association in 1890.

Grim played sparingly for the Broncos and the Milwaukee Brewers in 1891.

It wasn't until he joined the Louisville Colonels in 1892 that he became the starting catcher.

[2] Grim died in Indianapolis, Indiana, at the age of 93 and was interred at Crown Hill Cemetery.