Reginald Allen Harris (born August 12, 1968) is an American former professional baseball middle relief pitcher, who played in Major League Baseball (MLB) for the Oakland Athletics (1990–91), Boston Red Sox (1996), Philadelphia Phillies (1997), Houston Astros (1998), and Milwaukee Brewers (1999).

In a six-season career, Harris posted a 2–3 record with a 4.91 earned run average in 86 appearances, including 95 strikeouts, 81 walks, 28 games finished, and 121.0 innings of work.

In 2015, Harris was hired as pitching coach for the Sussex County Miners but left the team in early July.

In 2021, Harris was hired as pitching coach for the Gastonia Honey Hunters of the Atlantic League of Professional Baseball.

In 2023, Harris moved to the Staten Island FerryHawks of the Atlantic League of Professional Baseball to serve as their pitching coach.