Professional Super Smash Bros. competition involves professional gamers competing in the Super Smash Bros. series of crossover fighting games published by Nintendo. Organized tournament competition began in 2002 with Super Smash Bros. Melee, released for the GameCube in 2001; however, in the series' native Japan, there have been tournaments as early as 1999 with the original Super Smash Bros. for the Nintendo 64. Later tournaments have featured the other games in the series, with the two largest and most popular Smash Bros. scenes revolving around Melee and Super Smash Bros. Ultimate for the Nintendo Switch. Smaller scenes exist for the original game and Project M, a popular fan modification of Super Smash Bros. Brawl for the Wii, and to a lesser extent, Brawl itself. Major Smash Bros. tournaments include the GENESIS, Evolution Championship Series (EVO), Super Smash Con and The Big House annual series. Major League Gaming (MLG) has also previously included Smash Bros. games in its Pro Circuit.

Super Smash Bros. Melee is a 2001 crossover fighting video game developed by HAL Laboratory and published by Nintendo for the GameCube. It is the second installment in the Super Smash Bros. series. It features characters from Nintendo video game franchises such as Mario, The Legend of Zelda, Star Fox, Pokémon, and Donkey Kong among others. The stages and gameplay modes reference or take designs from these franchises as well.