Games like Orcs Must Die!
Games like Orcs Must Die! include Orcs Must Die! 2, Orcs Must Die! 3, Kingdom Rush - Tower Defense, Kingdom Rush 5: Alliance TD, and Grand Theft Auto V Legacy. We matched them by the tags players give Orcs Must Die! on Steam (Tower Defense, Action, Strategy, Third Person, and Fantasy): closest matches first, and among equally close ones the better-known games.

Orcs Must Die! 2
Shared: Tower Defense · Action · Strategy

Orcs Must Die! 3
Shared: Tower Defense · Strategy · Action

Kingdom Rush - Tower Defense
Shared: Tower Defense · Strategy · Singleplayer

Kingdom Rush 5: Alliance TD
Shared: Tower Defense · Strategy · Singleplayer

Grand Theft Auto V Legacy
Shared: Action · Third Person · Singleplayer

Plants vs. Zombies GOTY Edition
Shared: Tower Defense · Strategy · Singleplayer

Bloons TD 6
Shared: Tower Defense · Strategy · Singleplayer

Saints Row: The Third
Shared: Action · Comedy · Third Person

Kingdom Rush Frontiers - Tower Defense
Shared: Tower Defense · Strategy · Fantasy

GemCraft - Chasing Shadows
Shared: Tower Defense · Strategy · Action

Just Cause™ 3
Shared: Action · Singleplayer · Third Person

Rock of Ages
Shared: Strategy · Tower Defense · Action

Totally Accurate Battle Simulator
Shared: Strategy · Funny · Singleplayer

Orcs Must Die! Deathtrap
Shared: Tower Defense · Action · Strategy

Magicka
Shared: Action · Fantasy · Comedy

Rock of Ages 2: Bigger & Boulder™
Shared: Strategy · Action · Tower Defense

Bully: Scholarship Edition
Shared: Action · Third Person · Singleplayer

Dungeon Defenders
Shared: Tower Defense · Strategy · Singleplayer

Tomb Raider Game of the Year
Shared: Action · Third Person · Singleplayer

Warhammer 40,000: Space Marine 2
Shared: Action · Third Person · Third-Person Shooter

Middle-earth: Shadow of War
Shared: Action · Fantasy · Third Person

Monster Hunter: World
Shared: Action · Third Person · Fantasy

Just Cause 2
Shared: Action · Third Person · Singleplayer

Hogwarts Legacy
Shared: Fantasy · Singleplayer · Third Person