Games like Thief: Deadly Shadows
Games like Thief: Deadly Shadows include Dishonored, Thief Gold (1999), Dishonored 2, Thief, and A Plague Tale: Innocence. We matched them by the tags players give Thief: Deadly Shadows on Steam (Stealth, Atmospheric, Action, First-Person, and Classic): closest matches first, and among equally close ones the better-known games.

Dishonored
Shared: Stealth · Action · First-Person

Thief Gold (1999)
Shared: Stealth · Atmospheric · First-Person

Dishonored 2
Shared: Stealth · Action · First-Person

Thief
Shared: Stealth · Action · First-Person

A Plague Tale: Innocence
Shared: Stealth · Atmospheric · Story Rich

Thief II: The Metal Age
Shared: Stealth · Atmospheric · Steampunk

BioShock™
Shared: Atmospheric · Action · Steampunk

Batman™: Arkham Knight
Shared: Action · Stealth · Third Person

BioShock™ Remastered
Shared: Atmospheric · Action · First-Person

METRO 2033 Redux
Shared: Atmospheric · Action · Stealth

The Witcher 3: Wild Hunt — Remastered
Shared: Atmospheric · Story Rich · Action

METRO Last Light Redux
Shared: Atmospheric · Action · Stealth

BioShock Infinite
Shared: Action · First-Person · Atmospheric

Half-Life 2
Shared: Action · Classic · First-Person

METAL GEAR SOLID V: THE PHANTOM PAIN
Shared: Stealth · Action · Atmospheric

Dishonored®: Death of the Outsider™
Shared: Stealth · Action · First-Person

Metro Exodus
Shared: Atmospheric · Action · First-Person

Lies of P
Shared: Action · Steampunk · Story Rich

Styx: Master of Shadows
Shared: Stealth · Action · Atmospheric

Outlast
Shared: Atmospheric · First-Person · Horror

Middle-earth™: Shadow of Mordor™
Shared: Action · Stealth · Third Person

Deus Ex: Mankind Divided
Shared: Stealth · Action · Atmospheric

Black Mesa
Shared: Action · First-Person · Atmospheric

Hellblade: Senua's Sacrifice
Shared: Atmospheric · Dark · Story Rich