Games like Iron Age
Games like Iron Age include Crusader Kings III, Age of Empires II (Retired), Manor Lords, Age of Mythology: Retold, and Farthest Frontier. We matched them by the tags players give Iron Age on Steam (Hero Shooter, Tactical RPG, RTS, Grand Strategy, and Character Customization): closest matches first, and among equally close ones the better-known games.

Crusader Kings III
Shared: Grand Strategy · Strategy · Medieval

Age of Empires II (Retired)
Shared: RTS · Strategy · Medieval

Manor Lords
Shared: Strategy · Grand Strategy · Base Building

Age of Mythology: Retold
Shared: RTS · Strategy · Base Building

Farthest Frontier
Shared: Strategy · Building · Medieval

Workers & Resources: Soviet Republic
Shared: Strategy · Grand Strategy · Base Building

Age of Empires III: Definitive Edition
Shared: RTS · Strategy · Base Building

Against the Storm
Shared: Strategy · Grand Strategy · Base Building

Crusader Kings II
Shared: Grand Strategy · Strategy · Medieval

Age of Empires: Definitive Edition
Shared: RTS · Strategy · Base Building

Becastled
Shared: Strategy · Base Building · RTS

They Are Billions
Shared: Base Building · RTS · Strategy

Kingdom Heroes 8
Shared: Tactical RPG · RTS · Strategy

Medieval Kingdom Wars
Shared: RTS · Grand Strategy · Base Building

Planetary Annihilation: TITANS
Shared: RTS · Strategy · Base Building

Total War: MEDIEVAL II – Definitive Edition
Shared: Strategy · Grand Strategy · RTS

Mindustry
Shared: RTS · Base Building · Strategy

Total War: WARHAMMER III
Shared: RTS · Grand Strategy · Strategy

Supreme Commander: Forged Alliance
Shared: RTS · Strategy · Grand Strategy

Total War: WARHAMMER II
Shared: RTS · Strategy · Grand Strategy

Diplomacy is Not an Option
Shared: RTS · Base Building · Medieval

Mount & Blade II: Bannerlord
Shared: Strategy · Medieval · Character Customization

Empires of the Undergrowth
Shared: Strategy · Grand Strategy · Base Building

Age of History 3
Shared: RTS · Grand Strategy · Strategy