Harry William Parker (September 14, 1947 – May 29, 2012)[1] was an American professional pitcher in Major League Baseball who played in parts of six seasons spanning 1970 to 1976.

[2][3] 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.

[4] His most productive season came in 1973, when he went 8–4 with a 3.35 ERA and 63 strikeouts in 962⁄3 innings of work to become an integral contributor for the Mets' National League pennant run.

He surrendered a twelfth-inning one-out solo home run to Pete Rose that won Game 4 of the NLCS for the Cincinnati Reds.

[6] In the eleventh inning of Game 3 of the Fall Classic, Parker allowed a one-out walk to Ted Kubiak who advanced to second base on a Jerry Grote passed ball when Ángel Mangual struck out and scored the Oakland Athletics' winning run on Bert Campaneris' single to center field.