Single-player games like Space Empires III
Below are 15 single-player Steam games similar to Space Empires III, ranked by player overlap. Every pick carries Steam's Single-player category, so multiplayer-only titles or always-online games don't sneak in. imho.run pulls the category data from Steam directly — Single-player here matches what the store labels.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Space Empires III page.
Ranked picks
- 1
Horizon
Single-player alternative to Space Empires III — playable solo, no multiplayer required. Shares Strategy with Space Empires III.
Horizon is a turn-based space strategy game of galactic exploration and conquest in which you are in control of humanity’s destiny. You will explore deep space, find new frontiers and discover alien artifacts hidden on long-abandoned planets.
- 2
Space Empires V
Single-player alternative to Space Empires III — playable solo, no multiplayer required. Shares Strategy with Space Empires III.
Space Empires V is the latest edition in the Space Empires series. This new chapter completely updates the UI and takes the player into a real-time rendered 3D universe. Watch space battles played out in glorious detail and realistic effects. Expand, Explore, Exploit, and Exterminate in a huge living breathing galaxy.
- 3
Galactic Civilizations® II: Ultimate Edition
Single-player alternative to Space Empires III — playable solo, no multiplayer required. Shares Strategy with Space Empires III.
Get the complete GalCiv II saga including Galactic Civilizations II: Dread Lords, the expansion pack Dark Avatar, and the newest expansion pack Twilight of the Arnor!
- 4
Stellaris
Single-player alternative to Space Empires III — playable solo, no multiplayer required. Shares Strategy with Space Empires III.
Explore a galaxy full of wonders in this sci-fi grand strategy game from Paradox Development Studios. Interact with diverse alien races, discover strange new worlds with unexpected events and expand the reach of your empire. Each new adventure holds almost limitless possibilities.
- 5
Polaris Sector
Single-player alternative to Space Empires III — playable solo, no multiplayer required. Shares Strategy with Space Empires III.
Can anyone build an empire in a place like this? Other factions are naturally suspicious of newcomers and may wage war at the first sign of unidentified craft. Here, a natural death is an uncommon luxury.
- 6
Space Empires IV Deluxe
Single-player alternative to Space Empires III — playable solo, no multiplayer required. Shares Strategy with Space Empires III.
The award-winning Space Empires IV Deluxe is the latest edition in the Space Empires series. A grand strategy title in the space 4X (explore, expand, exploit, and exterminate) genre, Space Empires has already found a place in the heart of strategy gamers everywhere.
- 7
ENDLESS™ Space - Definitive Edition
Single-player alternative to Space Empires III — playable solo, no multiplayer required. Shares Strategy with Space Empires III.
ENDLESS™ Space is a turn-based 4X strategy game, covering the space colonization age in the ENDLESS™ Universe, where you can control every aspect of your civilization as you strive for galactic domination.
- 8
Final Theory
Single-player alternative to Space Empires III — playable solo, no multiplayer required. Shares Strategy with Space Empires III.
Final Theory is a 4X-lite turn-based strategy game where you command fleets of battleships engaged in a galactic civil war. It presents an exciting experience for both veteran players and those new to the genre. It features innovative combat mechanics but also hearkens back to some of the classics.
- 9
Master of Orion
Single-player alternative to Space Empires III — playable solo, no multiplayer required. Shares Strategy with Space Empires III.
The ascendant spacefaring 4X strategy game returns! A new chapter in the epic Master of Orion saga is poised to once again capture the imaginations of millions of gamers.
- 10
Sins of a Solar Empire II
Single-player alternative to Space Empires III — playable solo, no multiplayer required. Shares Strategy with Space Empires III.
Battle for galactic dominance in this real-time 4X strategy game with unrivaled scale! You’ll explore, expand, exploit, and exterminate through military force, diplomacy, trade, culture, influence, and other underhanded tactics.
- 11
Space Empires I
Single-player alternative to Space Empires III — playable solo, no multiplayer required. Shares Strategy with Space Empires III.
Space Empires I is the first chapter of the Space Empires series. A classic galactic conquest and turn-based strategy video game where you are the leader of a race of intelligent beings building large spaceships for interplanetary and interstellar travel through warp points between star systems.
- 12
ENDLESS™ Space 2
Single-player alternative to Space Empires III — playable solo, no multiplayer required. Shares Strategy with Space Empires III.
ENDLESS™ Space 2 is a Strategic Space Opera, featuring the compelling “just one more turn” gameplay, set in the mysterious ENDLESS™ Universe. As the leader of your civilization, will you impose your vision and build the greatest stellar empire?
- 13
Galactic Civilizations IV
Single-player alternative to Space Empires III — playable solo, no multiplayer required. Shares Strategy with Space Empires III.
Take command of a civilization that has just achieved faster-than-light travel in Galactic Civilizations IV, the newest entry in the award-winning space 4X strategy game series. Explore the galaxy, colonize worlds, shape cultures, make alliances, fight wars and pioneer new technologies.
- 14
Space Empires: Starfury
Single-player alternative to Space Empires III — playable solo, no multiplayer required. Shares Strategy with Space Empires III.
In Space Empires: Starfury you are on a wild intergalactic ride through the Space Empires universe. You are an undercover agent for the TCN (Terran Confederation Navy) trying to determine the cause of a recent escalation of pirate attacks in the Neutral territories.
- 15
Space Empires II
Single-player alternative to Space Empires III — playable solo, no multiplayer required. Shares Strategy with Space Empires III.
Explore the galaxy, discover and colonize new planets to acquire enough resources. Design your ships, choosing from different hulls, weapons, shields, and several devices. Once you advance with technologies, new systems will be available, and you will have to update your designs.