Stanley Harold "Betz" Klopp (December 22, 1910 – March 11, 1980) was a Major League Baseball pitcher. He played one season with the Boston Braves in 1944.
Klopp's lone victory came on July 30 over the Pittsburgh Pirates. Entering the game to replace an injured pitcher, Klopp successfully retired the next 2 batters before being replaced when the Braves next batted. The Braves regained the lead in that inning, with Klopp recording the victory.