Family name Steinþórsdóttir (Steinþórsdóttir 
) , globally, is a very rare cognomen. The cognomen Steinþórsdóttir is characteristic of Northern Europe, particularly Iceland, where it is quite a common surname.
| jóhanna steinþórsdóttir IS (b. 1907) |
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| rósa júlía steinþórsdóttir Icelandic association football player, IS |
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| sólveig steinþórsdóttir Icelandic violinist, IS (b. 1995) |
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| elísa gróa steinþórsdóttir IS (b. 1994) |
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