Frantzen or Frantzén is a surname. Notable people with the surname include:
Allen Frantzen (born 1947/48), American medievalist Björn Frantzén (born 1977), Swedish chef and restaurateur Jean-Pierre Frantzen (1890–1957), Luxembourgish gymnast Jørgen Frantzen (1935–2020), Danish rower Tom Frantzen (born 1954), Belgian sculptor William Frantzen (born 1993), Norwegian footballer
See also Franzen (disambiguation) Franz (disambiguation)