Reuss may refer to:
- Reuss (river) in Switzerland
- Reuss (state) or Reuß, several former states or countries in present-day Germany, and the Republic of Reuss
- Reuss Elder Line and Reuss Younger Line (House of Reuss), members include:
- At least 45 princes "Heinrich von Reuss"
- Augusta Reuss-Ebersdorf (1757-1831)
- Eleonore, Princess Reuss-Köstritz (1860-1917)