Hornstein, Gorenstein or Gornshteyn is a Jewish surname. Notable people with the surname include:
- Frank Hornstein (born 1959), American politician
- Harvey A. Hornstein, PhD, author of Brutal Bosses and their Prey: How to Identify and Overcome Abuse in the Workplace (1996). (See Workplace bullying: Further reading)
- Irving L. Gornstein, American lawyer
- Leslie Gornstein, American freelance entertainment writer and reporter
- Norbert Hornstein, American linguist
- Marty Hornstein (1937–2013), American film producer
- Michal Hornstein (1920–2016), Canadian businessman, art collector and philanthropist
- Michael Hornstein (born 1962), German jazz saxophonist
- Leo Ornstein (born Yuda-Leyb Gornshteyn; 1895–2002), Russian-American composer and pianist