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 21–30 of 110 games matching Action RTS · updated 12 Oct 2026

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Price
$$$ · Expensive
Players
👥 Not stated
Reviews
74% of 663

Sudden Strike 5 delivers real-time tactics in epic WWII battles. A host of tactical options and more than 300 playable units open-up multiple approaches to reach your objectives in a 25 mission campaign on historical battlefields in Europe and North Africa.

$
Released
Price
$ · Cheap
Players
👥 Not stated

Banana Drama is an indie RTS game. It offers a singleplayer and online multiplayer experience. Your monkey king is held captive by evil dinos - he needs help! Be part of the banana crew and join us on Discord!

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Released
Price
$ · Cheap
Players
👥 Not stated
Reviews
88% of 17

Wood’N’Destroy is a real-time strategy game where you build your base, gather resources, and command your army to destroy your enemies. Expand your economy, develop new technologies, and dominate the battlefield.

If you loved these, you'll love this

$$
Released
Price
$$ · Standard
Players
👥 Up to 3 players
Reviews
68% of 1,929

Retreating ends here. Defend Bastion against evil hordes, reclaim lost powers, rebuild ancient ruins, and adapt your tactics to reverse the siege. Shape your playstyle in this hero-strategy rogue-lite solo or co-op up to 3 players.

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$ · Cheap
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👥 Not stated
Reviews
90% of 10

Adversator is a fast-paced MOBA with short and intense matches. Fight your way up the highly competitive ranked ladder or play for fun in casual matches with no waiting time. Made by a solo indie developer with a stylized graphical touch and unique features you’ll find nowhere else.

If you loved these, you'll love this

$
Released
Price
$ · Cheap
Players
👥 Up to 4 players
Reviews
78% of 14

Choose your alchemist from a magical coven. Explore a hand-painted, post-apocalyptic fantasy world. Fend off hordes of magical beasts in this roguelite tower defense and survival game. Play solo or in co-op with up to 3 friends!

$
Released
Price
$ · Cheap
Players
👥 Up to 4 players
Reviews
88% of 76

Stellarcraft is a sci-fi tower defense adventure: explore alien planets, gather resources, build defenses, and fend off waves of enemies, solo or in 4-player co-op. 🚀

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$$ · Standard
Players
👥 Not stated

Command a nomadic empire where your base is as mobile as your fleet. Capture vital sectors to dynamically terraform the battlefield. Customize capital ships, issue sector-wide doctrines, and out-macro your foes. You aren’t just fighting on the map—you are rewriting it.

Free
Released
Price
Free
Players
👥 Not stated
Reviews
40% of 10

A multiplayer online hack-and-slash game set in a chaotic world. Fight on the battlefield, feel every hit, and battle with friends. Easy controls with auto combat and auto loot for casual play, plus manual skills and movement for players who want real action.

If you loved these, you'll love this

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Released
Price
$$ · Standard
Players
👥 Not stated
Reviews
73% of 272

CIRCLE EMPIRES returns! Expand your empire, circle by circle, in this fast-paced follow-up to the hit RTS. Gather resources, build armies, and defeat bosses (or your friends) in a world that changes with every game. With unique units and biomes, it's an addictive battle of wits and tactics.