List of massively multiplayer online games
{{Short description|none}}
{{unreferenced|date=June 2022|reason=RS needed to verify the (sub)categorisation of games per genre.}}
This is a list of notable massively multiplayer online games (MMOG), sorted by category.
Massively multiplayer online first-person shooter games (MMOFPS)
{{main|List of massively multiplayer online first-person shooter games}}
Massively multiplayer online role-playing games (MMORPG)
{{main|List of massively multiplayer online role-playing games}}
Massively multiplayer online real-time strategy games (MMORTS)
{{main|List of massively multiplayer online real-time strategy games}}
Massively multiplayer online turn-based strategy games
{{main|List of massively multiplayer online turn-based strategy games}}
Action
Browser games
- Agar.io
- Bin Weevils
- Blood Wars
- Castle of Heroes
- Club Penguin
- Command & Conquer: Tiberium Alliances
- Dark Orbit
- Empire & State
- Glitch
- Hattrick
- Ikariam
- Illyriad
- Imperia Online
- Little Space Heroes
- Lord of Ultima
- Miniconomy
- Moshi Monsters
- National Geographic Animal Jam
- NEO Shifters
- Ogame
- Omerta
- Pardus
- Pirate Galaxy
- Planetarion
- Poptropica
- Realm of the Mad God
- Runes of Magic
- Samurai Taisen
- Sentou Gakuen
- Slither.io
- Smallworlds
- Surviv.io
- Tenvi
- Terra Militaris
- TirNua
- Transformice
- Travian
- Tribal Wars
- Twin Skies
- Urban Dead
- World of the Living Dead: Resurrection
Browser games with [[3D rendering]]
Building games
Exploration
Puzzle
Social games
- Active Worlds
- Animal Jam Classic
- Bin Weevils
- EGO
- Flyff
- Free Realms
- Furcadia
- Habbo
- JumpStart
- Nicktropolis
- OurWorld
- Pirate101 (sister game to Wizard101)
- Red Light Center