Gruter or Grüter is a surname. It may refer to:
Gruter Jan Gruter or Gruytère, Latinized as Janus Gruterus (1560–1627), Flemish-born philologist, scholar, and librarian
Grüter Thomas Grüter (born 1966), Swiss footballer Franz Grüter (born 1963), Swiss businessman and politician
See also Gruters, disambiguation Gruter Institute, California-based American institute for Law and Behavioral Research