Games like Galactic Civilizations III
Games like Galactic Civilizations III include Stellaris, Sid Meier's Civilization®: Beyond Earth™, ENDLESS Space™ 2, Sid Meier’s Civilization® VI, and Sid Meier's Civilization® V. We matched them by the tags players give Galactic Civilizations III on Steam (Aliens, Sci-fi, 4X, Turn-Based Strategy, and Sandbox): closest matches first, and among equally close ones the better-known games.

Stellaris
Shared: Sci-fi · 4X · Grand Strategy

Sid Meier's Civilization®: Beyond Earth™
Shared: Sci-fi · Turn-Based Strategy · 4X

ENDLESS Space™ 2
Shared: Sci-fi · 4X · Turn-Based Strategy

Sid Meier’s Civilization® VI
Shared: Turn-Based Strategy · 4X · Grand Strategy

Sid Meier's Civilization® V
Shared: Turn-Based Strategy · 4X · Strategy

ENDLESS Legend™
Shared: 4X · Turn-Based Strategy · Strategy

ENDLESS Space™ - Definitive Edition
Shared: 4X · Sci-fi · Turn-Based Strategy

Galactic Civilizations® II: Ultimate Edition
Shared: 4X · Turn-Based Strategy · Grand Strategy

Warhammer 40,000: Gladius - Relics of War
Shared: 4X · Turn-Based Strategy · Sci-fi

Galactic Civilizations IV
Shared: 4X · Sci-fi · Grand Strategy

HUMANKIND™
Shared: 4X · Turn-Based Strategy · Strategy

XCOM: Enemy Unknown
Shared: Turn-Based Strategy · Sci-fi · Aliens

Heroes of Might and Magic: Olden Era
Shared: Turn-Based Strategy · 4X · Grand Strategy

Master of Orion
Shared: 4X · Sci-fi · Strategy

Age of Wonders: Planetfall
Shared: 4X · Sci-fi · Turn-Based Strategy

Shadow Empire
Shared: 4X · Turn-Based Strategy · Sci-fi

X4: Foundations
Shared: 4X · Sci-fi · Sandbox

Europa Universalis IV
Shared: 4X · Grand Strategy · Strategy

XCOM®: Chimera Squad
Shared: Turn-Based Strategy · Aliens · Sci-fi

Age of History II
Shared: Turn-Based Strategy · Grand Strategy · Strategy

STAR WARS™ Empire at War - Gold Pack
Shared: Sci-fi · Strategy · Moddable

Old World
Shared: 4X · Turn-Based Strategy · Grand Strategy

Distant Worlds 2
Shared: 4X · Sci-fi · Grand Strategy

Age of Wonders 4
Shared: 4X · Turn-Based Strategy · Strategy