Games like Zombie Outbreak: Undead Survival
Games like Zombie Outbreak: Undead Survival include Resident Evil 4, Left 4 Dead 2, Resident Evil 4 (2005), Resident Evil Requiem, and The Forest. We matched them by the tags players give Zombie Outbreak: Undead Survival on Steam (Action, Adventure, Shooter, Shoot 'Em Up, and 3D): closest matches first, and among equally close ones the better-known games.

Resident Evil 4
Shared: Action · Horror · Survival Horror

Left 4 Dead 2
Shared: Shooter · Action · Zombies

Resident Evil 4 (2005)
Shared: Action · Adventure · Horror

Resident Evil Requiem
Shared: Action · Horror · Zombies

The Forest
Shared: Adventure · Horror · Survival

Resident Evil 3 Nemesis (1999)
Shared: Action · Adventure · Horror

Resident Evil 2 (1998)
Shared: Action · Adventure · Horror

The Walking Dead: Saints & Sinners
Shared: Action · Adventure · Shooter

Resident Evil Revelations 2
Shared: Action · Horror · Adventure

Dying Light
Shared: Horror · Zombies · Survival Horror

Resident Evil 2
Shared: Horror · Action · Zombies

Resident Evil Village
Shared: Action · Horror · Survival Horror

Resident Evil (1996)
Shared: Action · Adventure · Horror

Resident Evil 0
Shared: Adventure · Action · Horror

DayZ
Shared: Survival · Shooter · Zombies

Dead Space™ 2
Shared: Shooter · Action · Horror

Resident Evil 7 Biohazard
Shared: Horror · Action · Survival Horror

Resident Evil 6
Shared: Action · Horror · Adventure

Far Cry 3
Shared: Action · Adventure · Shooter

The Last of Us™ Part I
Shared: Horror · Shooter · Zombies

PUBG: BATTLEGROUNDS
Shared: Shooter · Action · Survival

Darkwood
Shared: Adventure · Action · Horror

Resident Evil 5
Shared: Action · Adventure · Horror

Left 4 Dead
Shared: Action · Shooter · Zombies