Grønn is a surname of Norwegian origin, cognate to the English-language surname Green. People with that name include:
Birger Grønn (1898-1988), Norwegian engineer Hans Finne-Grønn (1903-2001), Norwegian painter Jørgen Finne-Grønn (1905-1998), Norwegian diplomat Karen Grønn-Hagen (1903-1982), Norwegian politician Ole Henrik Grønn (born 1984), Norwegian politician Stian Herlofsen Finne-Grønn (1869-1963), Norwegian lawyer, archivist, genealogist and museum director
Or the word "Grønn" could just refer to the colour green itself.
Not be confused with Gronn, a neighbourhood in the city of Luxembourg.
See also Grønning (disambiguation)