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 1–10 of 110 games matching Action RTS Β· updated 12 Oct 2026

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$
Released
Price
$ Β· Cheap
Players
πŸ‘₯ 1–16 players

Multiplayer pixel-art horror for 1-16 players. A manor drowned in darkness, a candle as your only ally, a monster on the prowl β€” and maybe traitors among you. Scavenge, barricade, hide, vote… and survive the night.

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$
Released
Price
$ Β· Cheap
Players
πŸ‘₯ Not stated
Reviews
100% of 3

You command Ukraine's air defense. Every night β€” missiles and drone swarms, and always fewer interceptors than targets. By day it's your turn: deep strikes past enemy radars. And when orders aren't enough β€” take the stick yourself.

Free
Released
Price
Free
Players
πŸ‘₯ Not stated
Reviews
40% of 50

A persistent, planet-scale real-time strategy MMO on one shared Earth. Forge alliances or betray them, hold your supply lines, and live with every mile of ground you take or lose. Real-time fronts that never pause. No rounds, no resets.

$
Released
Price
$ Β· Cheap
Players
πŸ‘₯ Not stated
Reviews
0% of 1

Iron Stars is a realistic space 4X strategy game where you explore believable star systems, colonize planets and moons, grow your population, and turn entire solar systems into industrial empires.

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$$
Released
Price
$$ Β· Standard
Players
πŸ‘₯ Up to 3 players
Reviews
86% of 82

Hold the line or everything falls. Wavecrashers is a 3-player co-op strategy game where heroes defend against relentless waves of enemies. Build powerful synergies, push your limits, and survive the chaos. Play solo with bots or team up with friends. Every run is a fight to endure the storm.

$
Released
Price
$ Β· Cheap
Players
πŸ‘₯ Not stated
Reviews
86% of 974

A massively multiplayer real-time strategy game pitting hundreds of players against one another. Over one million nuke each other every month.

$
Released
Price
$ Β· Cheap
Players
πŸ‘₯ Up to 4 players
Reviews
100% of 3

A 4-player co-op survival defense roguelite. By day, gather resources and build your base. By night, hold the line against endless waves. Gunners cannot build. Engineers cannot shoot. Survive all 30 nights together, or fall apart alone.

If you loved these, you'll love this

$
Released
Price
$ Β· Cheap
Players
πŸ‘₯ Not stated
Reviews
91% of 12

Type to survive! "Typing Clash" is a fast-paced strategy battle game where every word summons units and every keystroke shapes the battlefield. Build your army, unleash powerful skills, and out-type your opponents in chaotic real-time battles.

$$
Released
Price
$$ Β· Standard
Players
πŸ‘₯ Not stated
Reviews
84% of 38

Lead your small caravan on a great journey across the ancient world, in a story-driven base-building RTS where protecting your family and friends matters more than conquest.