Games like Medieval II: Base Game
Games like Medieval II: Base Game include Hearts of Iron IV, Mount & Blade II: Bannerlord, Stellaris, Sid Meier's Civilization® V, and Mount & Blade: Warband. We matched them by the tags players give Medieval II: Base Game on Steam (Downloadable Content): closest matches first, and among equally close ones the better-known games.

Hearts of Iron IV
Shared: Single-player · Strategy · Multi-player

Mount & Blade II: Bannerlord
Shared: Single-player · Multi-player · Strategy

Stellaris
Shared: Single-player · Multi-player · Strategy

Sid Meier's Civilization® V
Shared: Single-player · Multi-player · Strategy

Mount & Blade: Warband
Shared: Single-player · Multi-player · Steam Trading Cards

Age of Empires II (Retired)
Shared: Single-player · Strategy · Multi-player

Europa Universalis IV
Shared: Single-player · Multi-player · Strategy

Company of Heroes 2
Shared: Single-player · Strategy · Multi-player

Crusader Kings II
Shared: Single-player · Multi-player · Strategy

Age of Empires III: Definitive Edition
Shared: Single-player · Strategy · Multi-player

XCOM: Enemy Unknown
Shared: Single-player · Multi-player · Strategy

Age of Mythology: Extended Edition
Shared: Single-player · Strategy · Multi-player

Sid Meier’s Civilization® VI
Shared: Single-player · Strategy · Multi-player

Bloons TD 6
Shared: Single-player · Multi-player · Strategy

Total War: MEDIEVAL II – Definitive Edition
Shared: Single-player · Strategy · Multi-player

The Binding of Isaac: Rebirth
Shared: Single-player · Multi-player · Steam Trading Cards

Company of Heroes 3
Shared: Single-player · Strategy · Multi-player

Europa Universalis V
Shared: Single-player · Multi-player · Strategy

HUMANKIND™
Shared: Single-player · Strategy · Multi-player

BattleTech
Shared: Single-player · Multi-player · Strategy

PEAK
Shared: Single-player · Multi-player · Steam Trading Cards

Imperator: Rome
Shared: Single-player · Strategy · Multi-player

Total War: NAPOLEON – Definitive Edition
Shared: Single-player · Strategy · Multi-player

ENDLESS Space™ 2
Shared: Single-player · Strategy · Multi-player