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 61–70 of 110 games matching Action RTS · updated 12 Oct 2026

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100% of 1

Challenge through the skies in Olympus of the Heavens! Face powerful Olympian gods, conquer their temples, claim their flames, and ignite your own. Customize your build, collect legend rewards, and master your skills in this fast-paced action RPG.

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👥 Up to 4 players
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45% of 61

Our fears about the future came to pass. Millions eke out a pathetic existence soaked by drizzling rain and lit by flickering neons. One of them is you, a lone detective with a dark past. Sneak, shoot, and investigate alone or with partners, learning that some things are better left buried.

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Free
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Free
Players
👥 Not stated
Reviews
50% of 8

Play for Free !! Enter the world of swords and magic now. Team up with your friends in the fantasy world of your dreams, strategically select your heroes, and conquer your enemies.

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76% of 437

Warlords Under Siege is a mix of RTS and Roguelike genre, where you build a small city and defend it against continuous waves of enemies. Improve your assortment of weapons with each playthrough, unlocking new possibilities to beat the ever-increasing threat.

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👥 Up to 2 players
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74% of 9,522

Age of Darkness: Final Stand is a dark fantasy survival RTS where you must illuminate, build and defend humanity’s last bastion against hordes of Nightmares. Set in the remnants of a kingdom consumed by a deadly fog, you decide. Will you hide in the light? Or take back your world.

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100% of 1

War to the Core is a tactical multiplayer Moba/RTS hybrid where you control a mothership and battle on a team against other teams for total world domination. Use all the available resources, from interceptors, you can control while alive or dead to different upgradable ship components to win!

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100% of 3

Kill Me If You Can: Multiplayer Edition is an RPG and construction-based zombie survival defense game. Explore by day to gather resources and grow, then build defenses at night to hold back zombie hordes. Each character has unique skills, and you can control multiple characters during gameplay.

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75% of 28

2089 - Space Divided is a classic science fiction real-time strategy game in which you collect resources, build up your base, train troops and destroy your opponents with tactical skill.

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👥 Up to 4 players
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76% of 13

Arcane Wilds is a western themed fantasy RTS with a unique twist on resource management. Gather, steal, and transport resources to use them in battle strategically. Embark on a new journey, survive missions, face mystical creatures in battle and loot treasures to build and upgrade your home island.