Namesakes
Harald I Fairhair
(m) c. 850-c. 933 
Norwegian Kings and Queens 872-930
Harald I Bluetooth
(m) 910-986
Danish Kings and Queens 958-986
Harald II Greycloak
(m) c. 935-970
Norwegian Kings and Queens 961-970
Harald II
(m) c. 996-1018
Danish Kings and Queens 1014-1018
Harald III Hardrada
(m) 1015-1066
Norwegian Kings and Queens 1046-1066
Harald III Hen
(m) 1040-1080
Danish Kings and Queens 1074-1080
Harald IV Gille
(m) 1103-1136
Norwegian Kings and Queens 1130-1136
Harald of Denmark
(m) 1876-1949
Other Royalty 1876-1949 Denmark (prince)
Harald Julin
(m) 1890-1967
Olympic Medalists 1908; 1912; 1920 swimming - 100 m freestyle; water polo (silver/bronze)
Gorm of Denmark
(middle name Harald) (m) 1919-1991
Other Royalty 1919-1991 Denmark (prince)
Harald zur Hausen
(m) 1936-2023
Nobel Prize Winners 2008 (medicine)
Notable Scientists and Inventors
Harald V
(m) 1937-
Norwegian Kings and Queens 1991-
Ingolf of Denmark
(middle name Harald) (m) 1940-
Other Royalty 1940-1968 Denmark (prince)
Harald Norpoth
(m) 1942-
Olympic Medalists 1964 5000 m (silver)
Christian of Denmark
(middle name Harald) (m) 1942-2013
Other Royalty 1942-1971 Denmark (prince)
Harald Schmid
(m) 1957-
Olympic Medalists 1976; 1984 4x400 m relay; 400 m hurdles (bronze)