Surname Aðalsteinsson (Aðalsteinsson 
) , worldwide, is a rare cognomen. The family name Aðalsteinsson is habitual in Northern Europe, particularly Iceland, where it is quite a common surname.
| jón hnefill aðalsteinsson Icelandic scholar (1927-2010), IS (b. 1927) |
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| stefán aðalsteinsson IS (b. 1928) |
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| þorbergur aðalsteinsson Icelandic handball player, IS (b. 1956) |
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| aðalsteinn aðalsteinsson Icelandic footballer, IS (b. 1962) |
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| baldur ingimar aðalsteinsson Icelandic footballer, IS (b. 1980) |
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| bjarni hólm aðalsteinsson Icelandic football player, IS (b. 1984) |
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| davíð hildiberg aðalsteinsson swimmer, IS (b. 1990) |
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Atli, Gísli, Leifur, Tómas, Eggert, Hákon, Ólafur, Stefán, Andreas, Gunnar, Daníel, Eiríkur, Halldór, Heiðar, Ársæll, Ágúst, Sigurjón, Aðalsteinn, Kristján, Davíð, Guðmundur, Ragnar, Bjarki, Rafn, Geir, Jón, Arnar, Bragi, Kári, Daði, Gylfi, Pétur, Lárus, Hlynur, Árni, Ómar, Stefan, Sveinn, Arnór, Baldur, Björn, Einar, and Valdimar