Grünfeld is a surname, and may refer to:
- A. Tom Grunfeld (born 1946), American professor
- Alfred Grünfeld (1852-1924), Austrian pianist and composer
- Berthold Grünfeld (1932–2007), Norwegian psychiatrist, sexologist, and professor
- Dan Grunfeld (born 1984), American professional basketball player (son of Ernie Grunfeld)
- Ernie Grunfeld (born 1955), Romanian-born American NBA basketball player and executive
- Ernst Grünfeld (1893-1962), Austrian chess player and author, specializing in opening theory, who, for a brief period, was one of the strongest chess players in the world.
- Grünfeld Defence, a chess opening named after Ernst
- Neo-Grünfeld Defence, a chess opening named after Ernst
- Heinrich Grünfeld (1855-1931), Bohemian-Austrian violoncellist (brother of Alfred Grünfeld)
- Nina Grunfeld (born 1954), British writer and journalist
- Yehuda Gruenfeld (born 1956), Israeli chess player
- Yehuda Grunfeld (or Grünfeld) (1930-1960), Israeli economist
- Albert M. Greenfield (birth name Avrahm Gruenfeld) (1887-1967), Russian/Ukrainian-born American businessman and philanthropist