Harry William Parker (September 14, 1947 – May 29, 2012) was an American professional pitcher in Major League Baseball who played in parts of six seasons spanning 1970 to 1976. Listed at 6 feet 3 inches (191 cm), 190 pounds (86 kg), Parker batted and threw right-handed. He was born in Highland, Illinois and attended Collinsville High School.
Harry Parker posted a 15–21 record and a 3.85 earned run average in 128 pitching appearances, while playing for the St. Louis Cardinals, New York Mets and Cleveland Indians.
His most productive season came in 1973, when he went 8–4 with a 3.35 ERA and 63 strikeouts in 131 2⁄3 innings of work to become an integral contributor for the Mets National League pennant run.
He also had a 69–54 mark and a 3.31 ERA in eight minor league seasons between 1965 and 1973.