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This is a list of notable massively multiplayer online games ( MMOG), sorted by category.

Massively multiplayer online first-person shooter games (MMOFPS)

Massively multiplayer online role-playing games (MMORPG)

Massively multiplayer online real-time strategy games (MMORTS)

Massively multiplayer online turn-based strategy games

Action

• Armored Warfare
• Cartoon Network Universe: FusionFall
• CrimeCraft
• DC Universe Online
• Infantry Online
• SubSpace
• War Thunder
• World of Tanks
• World of Warplanes
• World of Warships

Browser games

• Agar.io
• Bin Weevils
• Blood Wars
• Castle of Heroes
• Club Penguin
• Command & Conquer: Tiberium Alliances
• Dark Orbit
• Empire & State
• 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

• Battlestar Galactica Online
• Dark Orbit (Since 2015)
• Dead Frontier
• Family Guy Online
• Fragoria
• Free Realms
• RuneScape
• Tanki Online

Building games

• Active Worlds
• Wurm Online

Exploration

• Uru Live

Puzzle

• Yohoho! Puzzle Pirates

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
• Second Life
• The Sims Online
• SmallWorlds
• Star Wars: The Old Republic
• Tanki Online
• There
• TirNua
• Toontown Online
• Transformice
• Virtual Magic Kingdom
• Virtual World of Kaneva
• vSide
• Wizard101 (sister game to Pirate101)
• Woozworld

Space simulation

• Dual Universe
• Elite Dangerous
• Eve Online

See also

• List of free massively multiplayer online games
• List of free multiplayer online games
• Multiplayer video game
• Massively multiplayer online role-playing game (MMORPG)
• Browser based game
• Chronology of MUDs