Frederik IX of Denmark (March 11, 1899 - January 14, 1972) was King of Denmark from 1947 until 1972. He married HRH Princess Ingrid of Sweden on May 24, 1935. They had three children, Queen Margrethe II of Denmark, who succeeded her father, HRH Princess Benedikte of Denmark, who is married to HSH Prince Richard zu Sayn-Wittgenstein-Berleburg, and HM Queen Anne-Marie of Greece, who in 1964 married HM King Constantine II of Greece.

da:Frederik 9. de:Friedrich IX. (D�nemark) pl:Fryderyk IX sv:Fredrik IX av Danmark zh:弗雷德里克九世 nl:Frederik IX van Denemarken