Family name Olasagasti (Olasagasti 
) , around the globe, is a rare surname. The cognomen Olasagasti is characteristic of Spain, where it is a rare surname, Argentina, and France, where it is a very rare surname. Much less frequently, Olasagasti is the forename as well as the last name.
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| Olasagasti | France, Argentina, Spain, Brazil, Mexico |
| maria josefa olasagasti yrastorza 1715-08-18, ES (b. 1715) |
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| maria joaquina olasagasti yrastorza 1722-12-05, ES (b. 1722) |
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| juan bauptista olasagasti altuna 1779-02-01, ES (b. 1779) |
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| juan antonio olasagasti altuna 1780-07-21, ES (b. 1780) |
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leontxo olasagasti gartzia Spanish chess player, ES (b. 1956) |
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| jesus olasagasti Spanish painter (1907-1955), ES (b. 1907) |
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| eduardo olasagasti irigoyen Spanish architect, ES (b. 1909) |
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joxe mari olasagasti Basque competitive wood chopper (aizkolari), ES (b. 1959) |
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eneko olasagasti Basque writer, ES (b. 1960) |
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| manuel olasagasti (b. 1924) |
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joana olasagasti FR (b. 1990) |
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| ramon olasagasti Spanish (Basque) writer, journalist, ES (b. 1972) |
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| itsaso olasagasti researcher |
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| felix olasagasti researcher (ORCID 0000-0002-2714-3568) |
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| itziar olasagasti Spanish rower, ES (b. 1989) |
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Ane, Gorka, Lidia, Jorge, Julen, Telmo, Nelly, Ernes, Eneko, Eider, Idoia, Olatz, Oscar, Urtzi, Martin, Maider, Maxime, Mirian, Miguel, Sarita, Stella, Amalur, Diana, David, Rosar, Ramon, Ada, Jon, Ion, Iã, Lide, Lolo, Jose, Josu, Juan, Emma, Adolfo, Olga, Marie, Miren, Mikel, Saioa, Alain, Amaia, Asier, Aitor, Clara, Patxi, Maria, and Ainhoa