Halldórsdóttir is an Icelandic patronymic surname, literally meaning "daughter of Halldór". Notable people with the name include:
- Elínborg Halldórsdóttir (born 1962), Icelandic musician and painter
- Guðný Halldórsdóttir (born 1954), Icelandic film director and screenwriter
- Hafrún Rakel Halldórsdóttir (born 2002), Icelandic footballer
- Kristín Halldórsdóttir (1939–2016), Icelandic politician and journalist
- Kolbrún Halldórsdóttir (born 1955), Icelandic politician
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