Despite the growing popularity of Mac, most MMOs and MMORPGs don't have mac compatible versions of their games. Microsoft Windows remains king when it comes to online gaming, but Mac users aren't completely left in the dark, as the most popular games do have Mac versions. Don't expect obscure Korean and Chinese MMORPGs to have Mac compatible versions though. The list below should be helpful for Mac users looking for MMORPGs to try out. The games listed below have officially supported Mac clients. VM Ware, Crossover, and other third party tools can be used to get many other MMOs functioning on Macs.

Mac Compatible MOBAs

League of Legends - Riot Game's free to play MOBA is one of the most successful games of all time. Without 60+ million monthly active users, Riot has the resources to develop a Mac OS X compatible client. League of Legends added an OS X compatible client in March, 2013.

Dota 2 - Valve's epic MOBA supported both a Mac and Linux game client within a weak of launching. The OS X client was released world-wide on July 18, 2013. With 800,000+ concurrent users online, Dota 2 is the second most successful MOBA in the world.

Heroes of the Storm - Blizzard's foray into the MOBA space. Heroes of the Storm, or HoTS for short, includes popular characters from all major Blizzard games - Diablo, Starcraft, and Warcraft.

Heroes of Newerth - S2's Dota inspired MOBA is both Mac OS X and Linux compatible.

Strife - A fast paced 3D MOBA with cartoony graphics from S2 Games. Features a unique crafting and pet system.

Savage 2 - A unique MOBA/FPS action MMO developed by S2 Games.

Dragons and Titans - A 5v5 dragon riding MOBA where two opposing teams compete to destroy their opponent's titan cage. Over 30 dragons and a unique weapon system.

Golden Rush - a unique 3v3v3v3 MOBA developed by a Russian game studio. Golden Rush is on all major platforms including MAC.

Mac Compatible MMO Shooters

Team Fortress 2 - Valve's cartoony free to play shooter has been Mac and Linux compatible since February 14, 2013. Team Fortress 2 is one of the highest rated PC games of all time.

War Thunder - This popular World War 2 simulator has a Mac client.

Star Conflict - A sci-fi themed space simulator with action oriented combat. Features instanced PvE and PvP battles.

World of Tanks - A popular World War 2 tank simulator with an officially supported Mac wrapper.

World of Tanks Blitz - The mobile version of this game made its way onto Steam in late 2016 and is Mac compatible!

Quake Live - A browser based shooter that's a remake of Quake 3: Arena.

No More Room in Hell - a free to play zombie survival game built on the Half Life 2 engine. Original HL2 not required.

Codename CURE - Although not an MMO, Codename CURE is a zombie themed survival shooter game.

Gear Up - a free to play robot building game that looks and plays a lot like Robocraft. Really simple mechanics, but tremendously fun.

Teeworlds - Originally available as a standalone title but now available on Steam, Teeworlds is a unique fast paced side scrolling shooter similar to classics like Soldat.

Robocraft - Build your own robots and battle against others online in this epic free to play shooter that played a bit like Armored Core, except much simpler.

Mac Compatible Virtual worlds / MMOs

Second Life - Second Life is easily the most recognizable and most popular virtual world. The game's developer insists that Second Life isn't a "game" but rather a virtual world. Second Life has both a Mac and Linux client.

8BitMMO - A sandbox MMO with retro graphics.

ARK: Survival Evolved - This dinosaur themed survival game is available on all major platforms including Mac (Mac/Linux/Windows).

Krosmaster Arena - This free to play tactical board game is available on both PC and MAC. The game is by Ankama, the same French developer behind Dofus and Wakfu.

Fishing Planet - Looking for a free to play fishing game? Fishing Planet is one of the only ones out there and it's available on Mac.

Unturned - One of the only free to play survival games is on Mac. Think Minecraft meets zombie survival!

Mac Compatible MMORPGs

World of Warcraft - Given that WoW is the most successful MMORPG of all time, it's no surprise that Blizzard Entertainment has a Mac version of the game. The game introduced had Mac OS X support from Day 1, and later introduced Mac support with Intel CPUs with patch 1.9.3.

Final Fantasy XIV - The world's second most popular subscription MMORPG supports MAC. The game has a bit of a history with on and off mac support, but with the launch of Stormblood, the game is back to firmly supporting MAC users.

Eve Online - CCP's epic space MMORPG has been Mac OS X compatible since November, 2007.

Trove - The voxel based MMORPG from Trion Worlds officially released a Mac Client in October, 2015. The Minecraft inspired MMO remains one of Trion's most successful titles.

Albion Online - A Sandbox fantasy MMORPG with no set class system developed by Sandbox Interactive. Albion Online is available on iOS, Android, Linux, and Windows as well.

Fallen Earth - The pay to play MMORPG gone free to play has supported a Mac client since March 10, 2010.

Guild Wars 2 - NCSoft's epic fantasy MMORPG is Mac compatible.

RuneScape - Despite being one of the oldest MMORPGs still in service, RuneScape remains incredibly popular. The game runes on HTML 5 and Java on the browser, so it's compatible with all operating systems.

Champions of Regnum - Developed by NGD Studios, this free to play title title is both OS X and Linux compatible.

Marvel Heroes 2015 - An action MMORPG with Diablo style gameplay set in the Marvel universe.

Star Trek Online - The only Star Trek themed MMORPG. Developed by Cryptic Studios and published by Arc Games.

Lord of the Rings Online - An MMORPG based on the popular books by J.R.R. Tolkien.

The Elder Scrolls Online - Based on the incredibly popular single player RPG series Elder Scrolls.

Wakfu - Developed by the French studio Ankama, the game supports both Linux and Mac.

Dofus - A turn based MMORPG. Also developed by Ankama.

Spiral Knights - A co-op action MMORPG that mixes puzzle solving with fighting.

Oort Online - A unique sandbox MMORPG that's buy to play.

Ryzom - a fantasy / sci fi themed MMORPG that originally launched back in 2004.

Vendetta Online - A 3D sci-fi themed MMORPG that launched back in 2004. Also available on Linux, Android, and iOS.

Conquer Online - a 2D fantasy MMORPG from TQ Digital.

Minions of Mirth - An old fantasy MMORPG released back in 2005.

Eternal Lands - An older fantasy MMORPG.

Planeshift - An MMORPG released back in 2002.

RPG MO - An indie developed retro MMORPG available on PC, Mac, Linux, iOS, and Android. A truly multiplatform MMORPG!

Mac Compatible MMOs

Hearthstone - Blizzard's epic collectible card game isn't only Mac compatible, it's truly a multi-platform game. It's available on Windows, OS X, Android, and iOS.

Spellstone - A collectible card game by Synapse Games and published by Kongregate. Interesting mechanics, but odd card balance system (upgraded cards are stronger with no down-side).

Fortnite - A sandbox co-op survival game developed and published by Epic Games. Built on the powerful Unreal 4 engine and is basically Minecraft meets Left 4 dead.

GetAmped 2 - A 3D cartoony brawler MMO from Cyberstep with anime inspired visuals.

Puzzle Pirates - A casual online game with MMO elements.

Osu! - A rhythm based MMO.

Robocraft - Create and customize your own robot/mech and battle it against others online.

Unturned - A free to play Zombie survival game with Minecraft-esque graphics.

Don't Starve Together - A gorgeous survival game with a unique art style inspired by Tim Burton. The goal of the game is to.... not starve with friends!

Card Hunter - A unique free to play card game that mixes RPG and strategy elements.

Honorable Mentions / Shut Down Games

Warhammer Online: Age of Reckoning - Was OS X compatible, but the game itself shut down on December 18, 2013 since its license for the "Warhammer" franchise expired.

EverQuest - The original EverQuest game had a Mac OS X only server since 2003, but it shut down in 2013. Seems odd that they segregated Mac users onto to their own server rather than just releasing a Mac compatible client.

City of Heroes - Developed by Cryptic Studios. The first superhero themed MMORPG. Succeeded by Champions Online.

FF14 - Square Enix's Final Fantasy 14 launched a Mac client in June, 2015. Square Enix pulled the Mac client in July, 2015 after a disastrous launch. The Mac client was buggy from the start. The mac client though has since been re-introduced and works much better now.

See here for a list of Linux MMORPGs