Games like Victoria 3: Volume 3
Games like Victoria 3: Volume 3 include Victoria 3, Europa Universalis IV, Victoria II, Crusader Kings II, and Imperator: Rome. We matched them by the tags players give Victoria 3: Volume 3 on Steam (Grand Strategy, Economy, Historical, Political Sim, and Strategy): closest matches first, and among equally close ones the better-known games.

Victoria 3
Shared: Grand Strategy · Economy · Strategy

Europa Universalis IV
Shared: Grand Strategy · Historical · Strategy

Victoria II
Shared: Grand Strategy · Historical · Economy

Crusader Kings II
Shared: Grand Strategy · Historical · Strategy

Imperator: Rome
Shared: Grand Strategy · Strategy · Historical

Europa Universalis V
Shared: Grand Strategy · Historical · Economy

Hearts of Iron IV
Shared: Grand Strategy · Strategy · Historical

Manor Lords
Shared: Grand Strategy · Strategy · Historical

Age of History II
Shared: Historical · Grand Strategy · Strategy

Crusader Kings III
Shared: Grand Strategy · Strategy · Historical

Sid Meier's Civilization VII
Shared: Grand Strategy · Strategy · Historical

Rebel Inc: Escalation
Shared: Grand Strategy · Strategy · Historical

Workers & Resources: Soviet Republic
Shared: Grand Strategy · Strategy · Historical

Terra Invicta
Shared: Grand Strategy · Strategy · Historical

Cities: Skylines
Shared: Strategy · Economy · Simulation

Democracy 4
Shared: Political Sim · Strategy · Economy

Sid Meier’s Civilization® VI
Shared: Grand Strategy · Strategy · Historical

Stellaris
Shared: Grand Strategy · Strategy · Simulation

Against the Storm
Shared: Strategy · Grand Strategy · Simulation

Plutocracy
Shared: Grand Strategy · Strategy · Economy

Empires of the Undergrowth
Shared: Grand Strategy · Strategy · Simulation

Tropico 6
Shared: Economy · Strategy · Political Sim

Old World
Shared: Grand Strategy · Strategy · Historical

Sid Meier's Civilization® V
Shared: Strategy · Historical · Grand Strategy