BattlEye is a proprietary anti-cheat software designed to detect players that hack or abusively use exploits in an online game.

It was initially released as a third-party anti-cheat for Battlefield Vietnam in 2004 and has since been officially implemented in numerous video games, primarily shooter games such as PUBG: Battlegrounds, Arma 3, Destiny 2, War Thunder, and DayZ.

BattlEye supports Valve Corporation's Proton compatibility layer and is usable on the Steam Deck.

[5][6] BattlEye continuously updates in background processes and has its own infrastructure which is connected to the game servers.

BattlEye is said to support a "global" ban system for cheaters using unique fingerprints that stop players switching accounts to defeat bans.