Robert Joseph Mariano (born June 5, 1957 at Sewickley, Pennsylvania) is an American professional baseball scout, and a former coach and manager. He served as the 2015 manager of the Sacramento River Cats of the Pacific Coast League, Triple-A affiliate of the San Francisco Giants of Major League Baseball. In 2016, he became a member of the Giants' Major League scouting staff, based in Fountain Hills, Arizona. He also has managed the Class A Stockton Ports (1994) and Vero Beach Dodgers (2001) and the Triple-A Tucson Toros (part of 1997).