Surname Castrillo (Castrillo 
) , around the world, is a common last name. The cognomen Castrillo is habitual in Latin America and the Caribbean, particularly Costa Rica, where it is quite a common surname, Nicaragua, and Bolivia, where it is quite a rare surname. In absolute terms, it most frequently occurs in Latin America and the Caribbean, particularly Costa Rica, Nicaragua, and Colombia. Much less frequently, Castrillo is the forename as well as the last name.
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| Castrillo | Colombia, Spain, Nicaragua, Guatemala, Costa Rica |
| francisco martínez de castrillo Spanish dentist, ES (b. 1520) |
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| hernando de lobo castrillo 17th century Bishop of Puerto Rico, ES (b. 1590) |
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| ignacio ibáñez del castrillo Spanish military personnel, ES (b. 1700) |
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| vicente castrillo (b. 1731) |
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agostino ernesto castrillo 20th century Italian Roman Catholic bishop, IT (b. 1904) |
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maría de la concepción castrillo ES (b. 1900) |
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| carlos de la trinidad borge y castrillo Roman Catholic bishop (b. 1888) |
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gerardo molina castrillo Uruguayan poet, UY (b. 1938) |
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| modesto castrillo Spanish military personnel, ES (b. 1912) |
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rocío castrillo Spanish writer, ES (b. 1963) |
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gissela castrillo Politician from Ecuador, EC |
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| roberto castrillo Cuban sport shooter, CU (b. 1941) |
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| eduardo castrillo Filipino sculptor, PH (b. 1942) |
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jaime castrillo Spanish cyclist, ES (b. 1996) |
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| jean castrillo FR (b. 1950) |
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