Robert Joseph MacDonald (born April 27, 1965) is an American former professional baseball pitcher.

He played in Major League Baseball (MLB) for the Toronto Blue Jays, Detroit Tigers, New York Yankees, and New York Mets.

MacDonald also played in Nippon Professional Baseball (NPB) for the Hanshin Tigers.

MacDonald played his first American professional season with their Rookie league Medicine Hat Blue Jays, Class A (Short Season) St. Catharines Blue Jays, and Class A Myrtle Beach Blue Jays in 1987, and his last with the Mets and their Triple-A Norfolk Tides in 1996.

MacDonald manages a semi-pro slow pitch softball team in Clearwater, Florida.