Forstmann is a German surname. Notable people with the surname include:
- Arnold Forstmann (1842-1914), German artist
- Gustav Forstmann (1908-1985), German naval commander
- Judith Forstmann (died 2009), Argentinian politician
- Julius Anthony (Tony) Forstmann, businessman
- Nicholas C. Forstmann aka "Nick" (1947-2001), businessman
- Theodore J. Forstmann aka "Ted" (1940-2011), businessman
- Walther Forstmann (1883-1973), German U-boat commander
See also
- Forstmann Little & Company
- ForstmannLeff (founded 1968), founded by J. Anthony Forstmann and Joel B. Leff
- Förstemann