Robert Marcel Fontaine (November 14, 1923 – March 25, 1994) was an American professional baseball player, scout and executive.

As a minor league baseball pitcher, Fontaine went 26–18 in five seasons (1941–42; 1946–48) in the Brooklyn Dodgers' farm system.

[1] He missed 1943–45 due to service in the United States Army Air Forces.

Then, upon the departure of Peter Bavasi for the presidency of the Toronto Blue Jays in June 1976, Fontaine was promoted to general manager.

His son Bob Fontaine Jr. has also worked in baseball as a scouting director, and his grandson, Matthew Thomas, was drafted by the Seattle Mariners in 2007.