Kjeldsen () is a surname. Notable people with the surname include:
Anton Westerlin Kjeldsen (born 1994), Danish producer and songwriter Berno Kjeldsen, Danish diplomat Erik Kjeldsen (1890–1976), Danish cyclist Mark Kjeldsen (1953–1992), founder member of The Sinceros and former member of the London R&B band, The Strutters Michael Kjeldsen (born 1962), Danish badminton player Søren Kjeldsen (born 1975), Danish golfer Tinne Hoff Kjeldsen, Danish mathematician
See also Royal Dansk, in 1990 it merged with another biscuit company, Kjeldsen