Wild West Online was an open-world Wild West PvP action game from 612 Games, released on Steam on 10 May 2018. It was not a story-driven MMO: its PvE activities existed mainly to support player conflict and roleplay.

At launch players picked a side in a war between two clans over Rosewell County, but in June 2018 the factions were dropped in favour of sheriffs versus outlaws with town capturing. There were public PvP events, resource gathering, farming, crafting and homesteading, a skill tree instead of fixed classes, robberies, posses and community roleplay servers.

The reception was cool, with Eurogamer calling it hollow, and the servers were switched off on 25 October 2018. The project later returned in a different form as New Frontier, while Wild West Online itself is gone.