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.

Justin McGrath, better known as Plup, is an American professional Super Smash Bros. player from Orlando, Florida. McGrath is considered to be one of the best Super Smash Bros. Melee players in the world, having been ranked as one of the top 10 Melee players every year since 2015.