Henry Knight "Heinie" Groh (September 18, 1889 – August 22, 1968) was an American professional baseball player and manager. He played in Major League Baseball as a third baseman from 1912 to 1927, spending nearly his entire career with the Cincinnati Reds and New York Giants before playing his final season for the Pittsburgh Pirates. He excelled as a defensive fielder, becoming the National League's top third baseman in the late 1910s and early 1920s, and captained championship teams with the 1919 Reds and 1922 Giants. Renowned for his "bottle bat", he was an effective leadoff hitter, batting .300 four times and leading the league in doubles twice and in hits, runs and walks once each.