Mobile Legends: Bang Bang (MLBB) is a mobile multiplayer online battle arena (MOBA) game developed and published by Chinese developer Moonton, a subsidiary of ByteDance. The game was released in 2016 and grew in popularity, most prominently in Southeast Asia.

At its base gameplay, the game puts 2 teams of 5 against each other in real time with at least 20-60 second matchmaking and 10-30 minute matches. Featuring traditional battle arena gameplay, players must fight over three lanes to take the enemy's tower and defend their own while securing objectives in order to pressure the opposing team. Like classic MOBAs, there is no hero training to level up or pay to play angle—winners and losers are decided based on skill, ability, and strategy.

Following success, Moonton has tapped into the esports scene with the creation of several regional tournaments dubbed as Mobile Legends: Bang Bang Professional League (MPL) that serves as a qualifier for the Mobile Legends World Championships. It was among the six games chosen for the first medal event of esports competition at the 2019 Southeast Asian Games (SEA) held in the Philippines. The game was also a medal event in the last SEA Games in Cambodia and will be one too in 2025, to be held in Thailand.

Originally named Mobile Legends: 5v5 MOBA, the initial release of the game in 2016 was met with criticism citing similarities with another MOBA game, League of Legends. As a result, Riot Games filed a lawsuit against Moonton for copyright infringement on two separate occasions: in July 2017 and May 2022. In June 2020, the game was banned in India along with 58 other Chinese apps due to security concerns by the government.