Helgadóttir is an Icelandic matronymic, literally meaning "daughter of Helgi". Notable people with the name include:

• 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

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