Best Online Co-Op Games on Steam
Unlike generic lists, our strategy game recommendations use a rigorous analysis of Steam user reviews to identify and feature only the best, community-validated online co-op games. For those who prefer not to search, check out lists of the most played, top deals and best free to play Online Co-Op games on Steam.
Filters & Lists
Natural Selection 2
A fast paced multiplayer shooter that pits aliens against humans in a strategic and action-packed struggle for survival!
Guns of Icarus Online
Assemble your crew, take to the skies in the premier PvP airship combat game. Guns of Icarus Online is all about flying massive airships, shooting big turret weapons, and working as a team for supremacy of the skies. Everyone as one, victory or death, together.
Rocketbirds: Hardboiled Chicken
Annihilate an evil penguin regime in this cinematic platform adventure game offering full solo and co-op campaigns.
Castle Crashers®
Hack, slash, and smash your way to victory in this award winning 2D arcade adventure from The Behemoth!
Borderlands 2
The Ultimate Vault Hunter’s Upgrade lets you get the most out of the Borderlands 2 experience.
Torchlight II
The adventure continues in Torchlight II! An Action RPG filled with epic battles, bountiful treasure, and a fully randomized world. Bring your friends along for the journey with online and LAN multiplayer.
Critter Crunch
Using Critter Crunch's 'Food Chain' mechanic, players will eat their way through a smorgasbord of levels and gorge on a feast of modes, including Co-op and Versus multiplayer.
Counter-Strike 2
For over two decades, Counter-Strike has offered an elite competitive experience, one shaped by millions of players from across the globe. And now the next chapter in the CS story is about to begin. This is Counter-Strike 2.
Tower Wars
Tower Wars combines elements of tower defense, RTS, and all-out multi-player mayhem to bring you a completely unique experience, delivered with a fun and funny not-so-old world style!
Iron Brigade
Join The Mobile Trench Brigade and protect humanity from the evil Monovision menace!
Awesomenauts
Use your power, show your might! Play this Multiplayer Online Battle Arena (MOBA) game! AWESOMENAUTS combines 2D platforming with team-based strategy and hero based action. Whether you are a new recruit or an intergalactic legend, play AWESOMENAUTS!
Orcs Must Die! 2
You’ve tossed, burned and sliced them by the thousands – now orcs must die more than ever before! Grab a friend and slay orcs in untold numbers in this sequel to the 2011 AIAS Strategy Game of the Year from Robot Entertainment.
Tribes: Ascend
This edition packages weapon DLC from ten previous expansions as well new featured content.
Tom Clancy's Ghost Recon: Future Soldier™
In Ghost Recon Future Soldier join an elite team of highly trained, cut-throat special-ops soldiers. Armed to the teeth with unrivalled combat technology, Ghost Recon takes you to the globe’s most deadly warzones to hunt down the highest value targets.
Dungeons & Dragons Online®
Enter a world of danger and adventure with Dungeons & Dragons Online® based on the beloved RPG that started it all.
Sins of a Solar Empire®: Rebellion
Command a space-faring empire in Sins of a Solar Empire: Rebellion, the new stand-alone expansion that combines 4X depth with real-time strategy gameplay.
The Lord of the Rings Online™
Join the world’s greatest fellowship of players in the award-winning online re-creation of J. R. R. Tolkien’s legendary Middle-earth.
Sonic the Hedgehog 4 - Episode II
The Sonic 4 Saga continues in Episode II with the return of a beloved side kick and fan-favorite villains! Following the events of Episode I, Metal Sonic has returned to form an alliance with Dr. Eggman! To face this new evil, Sonic will have to call upon an old friend to help him save the day!
Aliens: Colonial Marines Collection
You & your friends are the deadliest killers in the galaxy – the US Colonial Marines. It’s up to you to not just survive, but wipe out the Xeno infestation.
A Total War Saga: FALL OF THE SAMURAI
Experience the dramatic conflict of samurai culture and modern weaponry between the Imperial throne and the last Shogunate in 19th century Japan.
Realm of the Mad God Exalt
Embark on an exhilarating journey into the pixelated Realm of the Mad God! Join, an action-packed, free-to-play MMO bullet hell game. Discover a world with danger, challenges, and hidden treasures as you battle through waves of enemies. Team up with players and conquer dungeons to become a legend!
Star Trek Online
In Star Trek Online, the Star Trek universe appears for the first time on a truly massive scale. Players take the captain's chair as they command their own starship and crew. Explore strange new worlds, seek out new life and new civilizations, and boldly go where no one has gone before.
Serious Sam II
Serious Sam 2 is a shot of adrenaline to the hearts of first-person shooter fans across the world. This is serious!
Earth Defense Force: Insect Armageddon
Thousands of giant insects and aliens once again ravage the earth, and only the Earth Defense Force can stop them.