Games like Imperium
Games like Imperium include Stellaris, Sid Meier’s Civilization® VI, Sid Meier's Civilization®: Beyond Earth™, Europa Universalis IV, and ENDLESS Space™ 2. We matched them by the tags players give Imperium on Steam (Strategy, 4X, Grand Strategy, Turn-Based Strategy, and Exploration): closest matches first, and among equally close ones the better-known games.

Stellaris
Shared: Strategy · Grand Strategy · 4X

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

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

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

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

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

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

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

Total War: WARHAMMER
Shared: Strategy · 4X · Grand Strategy

Total War: ROME REMASTERED
Shared: Strategy · Grand Strategy · Turn-Based Strategy

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

Galactic Civilizations IV
Shared: Grand Strategy · 4X · Strategy

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

Sid Meier's Civilization VII
Shared: Strategy · Grand Strategy · 4X

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

Galactic Civilizations III
Shared: 4X · Turn-Based Strategy · Grand Strategy

Total War: WARHAMMER III
Shared: Strategy · Grand Strategy · Turn-Based Strategy

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

Old World
Shared: Strategy · 4X · Grand Strategy

Terra Invicta
Shared: Strategy · Grand Strategy · 4X

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

Total War: WARHAMMER II
Shared: Strategy · Turn-Based Strategy · Grand Strategy

Europa Universalis V
Shared: Strategy · Grand Strategy · Wargame

Master of Orion
Shared: Strategy · 4X · Grand Strategy