Cyber Stadium Series: Base Wars (commonly shortened to Base Wars or BaseWars) is a futuristically-themed sports game, released for the Nintendo Entertainment System on June 1, 1991.Set in a 24th-century wherein baseball team owners have grown tired of paying outrageous player salaries, they decide to replace their rosters with robots.

While maintaining basic baseball elements of pitching, batting, fielding, and base running, Base Wars adds a fighting element to the game featuring four robot classes; a traditional cyborg, a tank, a flybot, and lastly a mcycle. A player's robots can be upgraded with new and advanced weaponry and repaired with money earned for game wins during tournaments.