Tómasdóttir is an Icelandic patronymic surname, literally meaning "daughter of Thomas". Notable people with the name include:
- Halla Tómasdóttir (born 1968), Icelandic businessperson
- Karitas Tómasdóttir (born 1995), Icelandic footballer
- Sigríður Tómasdóttir (1874–1957), Icelandic environmentalist
- Sóley Tómasdóttir (born 1974), Icelandic politician
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