Rafael Santo Domingo Molina (born November 24, 1955) is a retired minor-league infielder who appeared briefly in the Major Leagues, for the Cincinnati Reds, as a pinch hitter in September 1979. A native of Orocovis, Puerto Rico, he was signed by the Reds as an amateur free agent in . Santo Domingo played his last professional season with their Triple-A affiliates, the Indianapolis Indians, in .
Formerly the hitting coach of the Pulaski Mariners, Santo Domingo is now an area scout based in Puerto Rico for the Seattle Mariners.