Hornstein
Hornstein may refer to:
- Hornstein (rock), a silicate-rich chemical sediment and one of the siliceous rocks
 - Hornstein (surname)
 - Hornstein, Austria, Burgenland
 - 6712 Hornstein (1990 DS1), a Main-belt Asteroid (f. 1990)
 - von Hornstein, name of a family of imperial knights in the south of Germany, near Riedlingen