Reich (German "realm" or "empire") may refer to:
- First Reich (962–1806), "Heiliges Römisches Reich Deutscher Nation"
- German Reich, "Deutsches Reich", Germany's official name from 1871 to 1945
- Second Reich (1871–1918), "Deutsches Kaiserreich"
- Weimar Republic (1918-1933), which continued to use "Deutsches Reich" as its official name
- Third Reich (1933–1945), "Drittes Reich", term for Nazi Germany
- Fourth Reich (disambiguation)
Reich may also refer to:
- Reich, Germany, a town in Rhineland-Palatinate
- Reich (board game), a 1979 board game about German Unification
- Reich (video game), a cancelled first-person shooter developed by UTV True Games
- Reich (surname)
- Das Reich (newspaper), a National Socialist newspaper
