Halvdan is a given name. Notable people with the name include:
Halvdan Aarsrud (1878–1925), Norwegian bailiff and politician for the Labour PartyHalvdan the Black (c. 810 – c. 860), ninth-century king of VestfoldHalvdan Wexelsen Freihow (1883–1965), Norwegian priest and culturistHalvdan (runemaster), runemaster in mid-11th century Södermanland, SwedenLie, Trygve Halvdan (1896–1968), Norwegian politician, labour leader, government official and authorHalvdan Holbø (1907–1995), Norwegian painterHalvdan Koht (1873–1965), Norwegian historian and politician representing the Labour PartyHalvdan Ljøsne (1929–2006), Norwegian painterHalvdan Sivertsen (born 1950), Norwegian singer-songwriter and guitaristHalvdan Skard (born 1939), Norwegian politician for the Labour PartyHalvdan Eyvind Stokke (1900–1977), Norwegian railway director and politician
