Games like Crusader Kings II
Games like Crusader Kings II include Crusader Kings III, Mount & Blade II: Bannerlord, Hearts of Iron IV, Age of History II, and Europa Universalis IV. We matched them by the tags players give Crusader Kings II on Steam (Grand Strategy, Strategy, Medieval, Historical, and Political Sim): closest matches first, and among equally close ones the better-known games.

Crusader Kings III
Shared: Strategy · Grand Strategy · Medieval

Mount & Blade II: Bannerlord
Shared: Strategy · Medieval · RPG

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

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

Europa Universalis IV
Shared: Grand Strategy · Strategy · Historical

Imperator: Rome
Shared: Grand Strategy · Strategy · Historical

Victoria II
Shared: Grand Strategy · Strategy · Historical

Mount & Blade: Warband
Shared: Medieval · Strategy · RPG

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

Victoria 3
Shared: Strategy · Grand Strategy · Simulation

Stellaris
Shared: Strategy · Grand Strategy · Simulation

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

Knights of Honor II: Sovereign
Shared: Strategy · Grand Strategy · Medieval

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

Sid Meier's Civilization® V
Shared: Strategy · Historical · Grand Strategy

Manor Lords
Shared: Strategy · Grand Strategy · Simulation

Heroes of Might and Magic: Olden Era
Shared: Strategy · Grand Strategy · RPG

Europa Universalis III Complete
Shared: Grand Strategy · Strategy · Historical

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

Europa Universalis V
Shared: Grand Strategy · Strategy · Historical

Mount & Blade: With Fire & Sword
Shared: Medieval · Strategy · RPG

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

Total War: ATTILA
Shared: Strategy · Historical · Grand Strategy

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