Games like Realm of Dread
Games like Realm of Dread include Lethal Company, Five Nights at Freddy's: Secret of the Mimic, Darkwood, SOMA, and Outlast. We matched them by the tags players give Realm of Dread on Steam (Action, Adventure, Action-Adventure, Atmospheric, and Exploration): closest matches first, and among equally close ones the better-known games.

Lethal Company
Shared: Horror · Exploration · Survival Horror

Five Nights at Freddy's: Secret of the Mimic
Shared: Adventure · Action · Horror

Darkwood
Shared: Adventure · Action · Horror

SOMA
Shared: Atmospheric · Horror · Psychological Horror

Outlast
Shared: Horror · Atmospheric · Survival Horror

SILENT HILL: Townfall
Shared: Adventure · Action · Horror

Escape the Backrooms
Shared: Horror · Psychological Horror · Survival Horror

Inside the Backrooms
Shared: Horror · Survival Horror · Adventure

Resident Evil Requiem
Shared: Action · Survival Horror · Horror

Firewatch
Shared: Adventure · Atmospheric · Exploration

Poppy Playtime
Shared: Horror · Survival Horror · Adventure

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

SILENT HILL f
Shared: Horror · Action · Psychological Horror

The Forest
Shared: Adventure · Horror · Action

Pacify
Shared: Horror · Exploration · Survival Horror

Total Chaos
Shared: Action · Adventure · Atmospheric

Atomic Heart
Shared: Adventure · Action · Action-Adventure

The Beast Inside
Shared: Adventure · Action · Horror

Backrooms: Escape Together
Shared: Horror · Atmospheric · Survival Horror

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

Resident Evil Village
Shared: Action · Horror · Survival Horror

A Plague Tale: Requiem
Shared: Action · Adventure · Action-Adventure

What Remains of Edith Finch
Shared: Atmospheric · Adventure · Exploration

Alan Wake
Shared: Action · Adventure · Horror