Helgadóttir is an Icelandic surname meaning daughter of Helgi. Notable people with the surname include:
Ásta Guðrún Helgadóttir (born 5 February 1990), former member of parliament Ásthildur Helgadóttir (born 1976), Icelandic footballer Gerður Helgadóttir (1928–1975), Icelandic sculptor and artist Guðrún Helgadóttir (born 1935), Icelandic writer Guðrún P. Helgadóttir (1922–2005), Icelandic writer, poet, scholar and educator Heiða Kristín Helgadóttir (born 1983), Icelandic politician and entrepreneur Helga Vala Helgadóttir (born 1972), Icelandic politician Ragnhildur Helgadóttir (1930–2016), Icelandic politician Þóra Björg Helgadóttir (born 1981), Icelandic footballer