Games like Thirty Years' War
Games like Thirty Years' War include Europa Universalis IV, Europa Universalis V, Hearts of Iron IV, Crusader Kings III, and Crusader Kings II. We matched them by the tags players give Thirty Years' War on Steam (Strategy, Simulation, Historical, Wargame, and Grand Strategy): closest matches first, and among equally close ones the better-known games.

Europa Universalis IV
Shared: Strategy · Historical · Simulation

Europa Universalis V
Shared: Strategy · Historical · Simulation

Hearts of Iron IV
Shared: Strategy · Historical · Grand Strategy

Crusader Kings III
Shared: Strategy · Simulation · Grand Strategy

Crusader Kings II
Shared: Strategy · Grand Strategy · Historical

Sid Meier’s Civilization® VI
Shared: Strategy · Historical · Grand Strategy

Manor Lords
Shared: Strategy · Simulation · Historical

Victoria 3
Shared: Strategy · Simulation · Grand Strategy

Age of History II
Shared: Strategy · Historical · Grand Strategy

Sid Meier's Civilization VII
Shared: Strategy · Grand Strategy · Historical

Imperator: Rome
Shared: Strategy · Simulation · Grand Strategy

Workers & Resources: Soviet Republic
Shared: Strategy · Simulation · Historical

Victoria II
Shared: Strategy · Historical · Grand Strategy

Against the Storm
Shared: Strategy · Simulation · Grand Strategy

Total War: ROME II - Emperor Edition
Shared: Strategy · Historical · Grand Strategy

Total War: THREE KINGDOMS
Shared: Strategy · Historical · Grand Strategy

Terra Invicta
Shared: Strategy · Simulation · Grand Strategy

Heroes' Vow: Three Kingdoms
Shared: Strategy · Simulation · Grand Strategy

Empires of the Undergrowth
Shared: Strategy · Simulation · Grand Strategy

Rebel Inc: Escalation
Shared: Strategy · Simulation · Historical

Old World
Shared: Strategy · Simulation · Historical

Darkest Hour: A Hearts of Iron Game
Shared: Strategy · Historical · Grand Strategy

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

Hearts of Iron III
Shared: Strategy · Grand Strategy · Historical