Games like Infected: Outpost
Games like Infected: Outpost include Among Us, Dead by Daylight, Phasmophobia, Escape the Backrooms, and R.E.P.O.. We matched them by the tags players give Infected: Outpost on Steam (Multiplayer, Online Co-Op, Social Deduction, Psychological Horror, and Psychological): closest matches first, and among equally close ones the better-known games.

Among Us
Shared: Multiplayer · Online Co-Op · Social Deduction

Dead by Daylight
Shared: Multiplayer · Online Co-Op · Horror

Phasmophobia
Shared: Online Co-Op · Multiplayer · Horror

Escape the Backrooms
Shared: Multiplayer · Online Co-Op · Horror

R.E.P.O.
Shared: Online Co-Op · Multiplayer · Horror

In Silence
Shared: Multiplayer · Online Co-Op · Horror

Pacify
Shared: Online Co-Op · Multiplayer · Horror

PUBG: BATTLEGROUNDS
Shared: Multiplayer · Survival · Online Co-Op

DEVOUR
Shared: Online Co-Op · Multiplayer · Horror

Left 4 Dead 2
Shared: Multiplayer · Online Co-Op · Horror

Backrooms: Escape Together
Shared: Multiplayer · Online Co-Op · Psychological Horror

The Outlast Trials
Shared: Multiplayer · Horror · Psychological Horror

Liars Bar
Shared: Multiplayer · Online Co-Op · Casual

DayZ
Shared: Online Co-Op · Multiplayer · Survival

Halloween: The Game
Shared: Multiplayer · Horror · Online Co-Op

BIGFOOT
Shared: Multiplayer · Online Co-Op · Horror

Demonologist
Shared: Multiplayer · Online Co-Op · Horror

PANICORE
Shared: Online Co-Op · Multiplayer · Horror

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

Witch It
Shared: Multiplayer · Online Co-Op · Casual

MECCHA CHAMELEON
Shared: Multiplayer · Online Co-Op · Casual

Buckshot Roulette
Shared: Multiplayer · Horror · Psychological

Fears to Fathom® - Scratch Creek
Shared: Multiplayer · Horror · Psychological Horror

Secret Neighbor: Hello Neighbor Multiplayer
Shared: Multiplayer · Online Co-Op · Horror