Games like Dungeon Settlers
Games like Dungeon Settlers include RimWorld, Oxygen Not Included, Frostpunk, Space Haven, and Manor Lords. We matched them by the tags players give Dungeon Settlers on Steam (Dungeon Crawler, Colony Sim, Strategy, Management, and Base Building): closest matches first, and among equally close ones the better-known games.

RimWorld
Shared: Colony Sim · Strategy · Base Building

Oxygen Not Included
Shared: Colony Sim · Base Building · Survival

Frostpunk
Shared: Strategy · Colony Sim · Survival

Space Haven
Shared: Colony Sim · Strategy · Base Building

Manor Lords
Shared: Strategy · Base Building · Simulation

Dwarf Fortress
Shared: Colony Sim · Strategy · Base Building

Banished
Shared: Colony Sim · Strategy · Survival

Against the Storm
Shared: Strategy · Base Building · Simulation

Crusader Kings III
Shared: Strategy · Medieval · Management

Going Medieval
Shared: Colony Sim · Strategy · Base Building

Prison Architect
Shared: Colony Sim · Simulation · Base Building

Kingdoms and Castles
Shared: Colony Sim · Management · Strategy

Norland
Shared: Strategy · Colony Sim · Base Building

Empires of the Undergrowth
Shared: Strategy · Base Building · Colony Sim

Stranded: Alien Dawn
Shared: Base Building · Strategy · Colony Sim

Ostriv
Shared: Strategy · Colony Sim · Management

Infection Free Zone
Shared: Base Building · Strategy · Management

Workers & Resources: Soviet Republic
Shared: Strategy · Base Building · Simulation

Foundation
Shared: Strategy · Simulation · Management

They Are Billions
Shared: Colony Sim · Strategy · Base Building

Settlement Survival
Shared: Colony Sim · Management · Survival

Kingdoms Reborn
Shared: Colony Sim · Management · Base Building

Sheltered 2
Shared: Strategy · Colony Sim · Survival

Frostpunk 2
Shared: Strategy · Survival · Simulation