Games like War on the Sea
Games like War on the Sea include UBOAT, Hearts of Iron IV, Men of War: Assault Squad 2, Sea Power : Naval Combat in the Missile Age, and Wargame: Red Dragon. We matched them by the tags players give War on the Sea on Steam (Strategy, Naval, Simulation, World War II, and Naval Combat): closest matches first, and among equally close ones the better-known games.

UBOAT
Shared: Simulation · World War II · Naval

Hearts of Iron IV
Shared: Strategy · World War II · War

Men of War: Assault Squad 2
Shared: Strategy · World War II · Simulation

Sea Power : Naval Combat in the Missile Age
Shared: Strategy · Simulation · Naval Combat

Wargame: Red Dragon
Shared: Strategy · Wargame · RTS

Steel Division 2
Shared: Strategy · World War II · Simulation

Call to Arms - Gates of Hell: Ostfront
Shared: Strategy · World War II · Singleplayer

Company of Heroes 2
Shared: Strategy · World War II · War

Cold Waters
Shared: Simulation · Strategy · Naval

Steel Division: Normandy 44
Shared: Strategy · World War II · Simulation

Ultimate Admiral: Dreadnoughts
Shared: Naval · Naval Combat · World War II

Squad 44
Shared: World War II · Simulation · Singleplayer

Hell Let Loose
Shared: World War II · Singleplayer · War

Mount & Blade II: Bannerlord
Shared: Strategy · War · Singleplayer

Totally Accurate Battle Simulator
Shared: Simulation · Strategy · War

Company of Heroes 3
Shared: Strategy · Singleplayer · World War II

Silent Hunter® III
Shared: Simulation · Naval Combat · Naval

Company of Heroes
Shared: Strategy · World War II · Singleplayer

Ultimate Admiral: Age of Sail
Shared: Strategy · Simulation · Naval

Silent Hunter 5®: Battle of the Atlantic
Shared: Simulation · Naval · Naval Combat

WARNO
Shared: Strategy · Wargame · War

Blitzkrieg 3
Shared: Strategy · World War II · War

Bomber Crew
Shared: Simulation · Strategy · World War II

DEFCON
Shared: Strategy · Simulation · Singleplayer