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 61–70 of 213 games matching RTS · updated 12 Oct 2026

Filters: RTS × Clear all
$
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. 🚀

$$
Released
Price
$$ · Standard
Players
👥 Not stated
Reviews
79% of 1,893

Desynced is a sci-fi strategy game with fully customizable units and behaviors. Gather, build, research, and explore the unknown. Alone or with friends, unveil the mystery of an AI on the edge of self-awareness and uncover the hidden truth in this blend of strategy, automation, and exploration.

If you loved these, you'll love this

$$
Released
Price
$$ · 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.

$
Released
Price
$ · Cheap
Players
👥 Up to 4 players
Reviews
100% of 1

Command your forces against endless waves of enemies in this intense RTS. Build bases, manage resources, and defend the Omega Beacon across procedurally generated worlds. Play solo or team up with friends via Steam multiplayer.

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

$$
Released
Price
$$ · 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.

$$
Released
Price
$$ · Standard
Players
👥 Not stated
Reviews
84% of 743

From a small village of a dozen people to a small kingdom of thousands of people. Arrange for residents to work, gathering, fishing and hunting, farming and mining, processing and manufacturing. Trade, accumulate supplies, increase your strength, and fight evil forces and monsters.

If you loved these, you'll love this

$
Released
Price
$ · Cheap
Players
👥 Not stated
Reviews
94% of 17

Build spacecrafts and fight with or against your friends! This game offers physics driven gameplay, with a variety of weapons and powerups. Slice your enemies in half with a laser beam, or erase them from existence with a black hole bomb!