Games like The Fog
Games like The Fog include Outlast, Poppy Playtime, Bendy and the Dark Revival, Outlast 2, and Resident Evil Village. We matched them by the tags players give The Fog on Steam (Action, Adventure, Indie, Based On A Novel, and Horror): closest matches first, and among equally close ones the better-known games.

Outlast
Shared: Horror · Survival Horror · First-Person

Poppy Playtime
Shared: Horror · Singleplayer · Dark

Bendy and the Dark Revival
Shared: Action · Horror · Adventure

Outlast 2
Shared: Horror · Survival Horror · Singleplayer

Resident Evil Village
Shared: Action · Horror · Survival Horror

The Beast Inside
Shared: Adventure · Horror · Action

Bendy and the Ink Machine
Shared: Horror · Singleplayer · First-Person

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

Resident Evil Requiem
Shared: Action · Horror · Survival Horror

Slender: The Arrival
Shared: Horror · Indie · Survival Horror

Five Nights at Freddy's: Security Breach
Shared: Horror · Singleplayer · Survival Horror

Five Nights at Freddy's
Shared: Horror · Singleplayer · Indie

Resident Evil 4
Shared: Action · Horror · Singleplayer

Escape the Backrooms
Shared: Horror · Adventure · Survival Horror

Darkwood
Shared: Adventure · Action · Horror

Visage
Shared: Horror · Dark · Survival Horror

Dark Deception
Shared: Horror · Singleplayer · Action

The Forest
Shared: Horror · Adventure · Action

Blair Witch
Shared: Adventure · Horror · Indie

Little Nightmares
Shared: Adventure · Horror · Singleplayer

Penumbra Overture
Shared: Adventure · Horror · Indie

We Happy Few
Shared: Adventure · Action · Indie

Ultimate Custom Night
Shared: Horror · Singleplayer · Survival Horror

Granny
Shared: Horror · Singleplayer · Survival Horror