Online co-op Action RTS games

Every online co-op Action RTS game on Steam we know of, newest first. Add tags or a price band to narrow it down.

Showing 81–90 of 110 games matching Action RTS · updated 12 Oct 2026

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$ · Cheap
Players
👥 Not stated

Isocraft Story is an isometric Minecraft-like sandbox game. Shape the infinite and procedurally-generated block world. Collect materials, play online, advance to higher tiers of tools and weapons, go deeper into the world and build a new spaceship to escape from this planet!

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$
Released
Price
$ · Cheap
Players
👥 Up to 2 players
Reviews
93% of 15

Build your ultimate defense with a combination of powerful towers. Attack your opponent with strong Invaders. This game is sure to offer a unique and immersive experience for all tower defense enthusiasts!

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88% of 471

Employ lethal turrets, traps, and gadgets to defend against an onslaught of evolving creeps! Step into a twisted, hyper 3D, mind bending realm. Upgrade and adapt your defenses. Become a master maze crafter. Collect bizarre artifacts. Rush creeps for lucrative rewards, and succumb to greed!

$
Released
Price
$ · Cheap
Players
👥 Up to 2 players
Reviews
100% of 8

Try this small real time strategy and roguelike game where you need to defend your base against multiple waves . Each run you will have to choose between unique units and unique buffs.

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Players
👥 Up to 4 players
Reviews
88% of 373

Gather resources, build your base, and lead your people to victory in this captivating reimagining of classic RTS, set in the Bronze Age. Secure fertile land, fend off raids, and stockpile food to generate knowledge and unlock powerful village advancements.

Free
Released
Price
Free
Players
👥 Not stated
Reviews
61% of 1,057

World War Armies is the ultimate PvP real-time strategy game. Command advanced war machines and compete for free against other players worldwide. Revolutionary mechanics reduce downtime and focus on direct engagement with the enemy, you get to the fun parts of RTS faster.

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👥 Up to 3 players
Reviews
69% of 182

TrinityS condenses the thrilling elements of MMO RPG endgame encounters into a white-knuckle, "Boss Rush" cooperative online action game for up to three players. Skip the MMO level grind and face off against fearsome foes that require precise coordination to defeat!

If you loved these, you'll love this

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$$ · Standard
Players
👥 Up to 8 players
Reviews
25% of 4

Solar Kingdoms is a real-time strategy game where you command forces across solar systems, engaging in large battles both in space and on the surfaces planets. Establish colonies, find resources and artifacts, and fight up to 8 factions in skirmish, large campaign, missions, and multiplayer.

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$$ · Standard
Players
👥 Not stated
Reviews
93% of 809

Godsworn is a classic RTS with single-player & co-op focus. Experience an epic fantasy retelling of the Baltic Crusades set in a world inspired by pagan mythology. Choose a divine hero, rally worshippers alongside mythical creatures, and smite the unworthy!