Cognomen Quadros (Quadros 
) , around the world, is a common surname. The surname Quadros is characteristic of Brazil, where it is quite a common surname, Portugal, where it is quite a rare surname, and United Arab Emirates. Not in comparison with a country's population, the name is most common in Brazil, India, and Portugal.
| VARIANT | COUNTRY |
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| Quadros | United Arab Emirates, Portugal, India, Brazil, United States |
| didacus de quadros (b. 1677) |
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| josé caetano de mesquita e quadros (b. 1726) |
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| joaquim inácio de quadros PT (b. 1785) |
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francisco raimundo ewerton quadros BR (b. 1841) |
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jânio da silva quadros Brazilian politician (1917-1992), BR (b. 1917) |
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eloá quadros 23rd First Lady of Brazil, BR (b. 1923) |
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ciro de quadros Brazilian physician (1940-2014), BR (b. 1940) |
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| alberto quadros person identified in the Museu da Pessoa collection, BR (b. 1899) |
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| antónio quadros Portuguese writer, poet and literary critic (1923-1993), PT (b. 1923) |
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bruno quadros Brazilian association football player, BR (b. 1977) |
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| anna letycia quadros Brazilian artist and educator (1929-2018), BR (b. 1929) |
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carine quadros Brazilian actress, BR (b. 1981) |
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| antónio quadros Portuguese painter, PT (b. 1933) |
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| nilo pacheco de quadros (b. 1925) |
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ketleyn quadros Brazilian judoka, BR (b. 1987) |
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