Online co-op RTS games

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

Showing 31–40 of 213 games matching RTS · updated 12 Oct 2026

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Free
Released
Price
Free
Players
👥 Not stated
Reviews
16% of 2,498

Conqueror's Blade: Three Kingdoms is an open-world action war game blending hero combat and troop command. Lead legendary armies alongside allies to siege cities and claim vital resources. Forge alliances, crush rival factions, and seize the realm with steel and strategy!

$$$
Released
Price
$$$ · Expensive
Players
👥 Up to 2 players
Reviews
77% of 1,256

ZeroSpace is a hybrid sci-fi RTS / RPG game that allows you to play as the commander of The Protectorate, a galactic force dedicated to securing humanity’s place in the galaxy. The Orion sector is locked in a vicious power struggle between many alien factions, ready to fight to the death.

$
Released
Price
$ · Cheap
Players
👥 1–8 players

Command one ball at a time — switch freely between soldiers while the rest fight on their own! 5 soldier types, 10 roguelike buffs, and 2 wild modes (PVP / PVE daily global challenges). 1–8 players, local or online. Chaos guaranteed.

$
Released
Price
$ · Cheap
Players
👥 Not stated
Reviews
100% of 2

Develop your nation, command your army, and dominate the world in a real-time strategy game combining economic management, diplomacy, technological progress, and military conquest.

Free
Released
Price
Free
Players
👥 Up to 16 players
Reviews
84% of 19

A multiplayer top-down tank game for up to 16 players. Capture bases and pillboxes, harvest trees, build roads and walls, lay mines, and battle for control of the island. The Macintosh classic, rebuilt for modern platforms — free, open source, and cross-platform across desktop, mobile, and web.

If you loved these, you'll love this

$
Released
Price
$ · Cheap
Players
👥 Up to 5 players

In a fantastic universe, form a group of up to 5 dwarves. Choose a class then set off on an adventure in mines. Be careful, one of you will have become a monster, born to hunt you. Your goal is to extract materials there. Survive by working as a team but also using many gameplay features

$$
Released
Price
$$ · Standard
Players
👥 Not stated

Become the plague in an asymmetrical player verses simulation battle for immortality. Infect populations, collapse economies, and harvest the dead to fuel your path to lichhood; only if you can conquer an adaptive world fighting to survive.

If you loved these, you'll love this

$
Released
Price
$ · Cheap
Players
👥 Not stated
Reviews
79% of 249

Fend off brutal waves of demonic hordes in this epic fantasy tower defense survivors like! Hack and slash among the action or zoom to strategically control the battlefield. You are the city’s last line of defense, build your base, defend the gate!

If you loved these, you'll love this

$
Released
Price
$ · Cheap
Players
👥 2–8 players
Reviews
100% of 1

Broken Crown is a fantasy RTS where you build a settlement, gather resources, research powerful upgrades, and command hundreds of units in formation-based battles. Advance troops through five visual tiers, preserve Bronze-to-Gold veterans, and conquer tactical maps shaped by Fog of War.