R.B.I. Baseball 3 is the third game in Tengen's R.B.I. Baseball series of baseball simulators, and the second game in the series to not be based directly on Namco's Family Stadium (Famista) series. It is sometimes erroneously considered the localization of the third Family Stadium game, Pro Yakyuu Family Stadium '88: in fact, the two series split apart completely after the first game. It would also be the last R.B.I. Baseball game to be released on NES.
Like many Tengen games, it was unlicensed by Nintendo. It was, however, licensed by the MLBPA and features the names of various baseball players active at the time. The game doesn't have the MLB license and so all the teams are referred to by their cities rather than their team names ("Baltimore" rather than "Baltimore Orioles").