Red Dead Online is an online multiplayer action-adventure game developed and published by Rockstar Games as the multiplayer component of Red Dead Redemption 2. After several months in beta, Red Dead Online was released for PlayStation 4 and Xbox One in May 2019,[a] and for Microsoft Windows and Stadia in November 2019. Players take on the role of a silent protagonist who is freed from prison and tasked with taking revenge in exchange for their innocence. Set one year before the events of the single-player game, Red Dead Online comprises story missions where four players complete tasks to advance the narrative. The game also features several side missions and events.

Like the single-player game, Red Dead Online is presented through both first and third-person perspectives, and the player may freely roam in its interactive open world. Gameplay elements include shootouts, heists, hunting, horseback riding, interacting with non-player characters, and maintaining the character's honor rating through moral choices and deeds. A bounty system governs the response of law enforcement and bounty hunters to crimes committed by players. Players can traverse the open world alone or in a posse of up to seven players, with or against whom they can partake in organized activities.

Developed in tandem with the single-player story, Red Dead Online is viewed as a separate product despite the development team's wishes to translate elements of the single-player to a multiplayer environment. The team took lessons learned from the multiplayer of Red Dead Redemption and Grand Theft Auto Online when developing the game. Red Dead Online received criticism at launch for its balancing of gameplay and in-game currency; later updates addressed the issues. It received positive responses with praise for its presentation of missions, co-operative events, and technical improvements. The game is set to receive several updates over time, as with Grand Theft Auto Online; the Frontier Pursuits update in September 2019 implemented roles that players can select to earn additional rewards.