Games like One Tower Defense
Games like One Tower Defense include Bloons TD 6, PUBG: BATTLEGROUNDS, Dota 2, Counter-Strike 2, and Legion TD 2 - Multiplayer Tower Defense. We matched them by the tags players give One Tower Defense on Steam (Tower Defense, Real Time Tactics, Strategy, Multiplayer, and Roguelike): closest matches first, and among equally close ones the better-known games.

Bloons TD 6
Shared: Tower Defense · Strategy · Multiplayer

PUBG: BATTLEGROUNDS
Shared: PvP · Multiplayer · Survival

Dota 2
Shared: Strategy · Multiplayer · PvP

Counter-Strike 2
Shared: Multiplayer · Action · PvP

Legion TD 2 - Multiplayer Tower Defense
Shared: Tower Defense · Strategy · Multiplayer

Dungeon Defenders
Shared: Tower Defense · Multiplayer · Strategy

Tom Clancy's Rainbow Six Siege
Shared: PvP · Multiplayer · Tactical

Orcs Must Die! 3
Shared: Tower Defense · Strategy · Co-op

Bloons TD 5
Shared: Tower Defense · Strategy · Co-op

Total War: WARHAMMER II
Shared: Strategy · Multiplayer · Action

Element TD 2 - Tower Defense
Shared: Tower Defense · Real Time Tactics · Strategy

Orcs Must Die! 2
Shared: Tower Defense · Strategy · Co-op

Total War: WARHAMMER III
Shared: Strategy · Real Time Tactics · Action

Company of Heroes 3
Shared: Strategy · Multiplayer · Real Time Tactics

Risk of Rain 2
Shared: Co-op · Multiplayer · Roguelike

ELDEN RING NIGHTREIGN
Shared: Multiplayer · Co-op · Roguelike

Left 4 Dead 2
Shared: Co-op · Multiplayer · Action

Squad
Shared: PvP · Multiplayer · Tactical

Sanctum 2
Shared: Tower Defense · Strategy · Co-op

Don't Starve Together
Shared: Co-op · Multiplayer · Survival

Dungeon Defenders: Awakened
Shared: Tower Defense · Multiplayer · Co-op

Company of Heroes 2
Shared: Strategy · Multiplayer · Tactical

Total War: THREE KINGDOMS
Shared: Strategy · Multiplayer · Real Time Tactics