Cognomen Costilla (Costilla 
) , throughout the world, is a common last name. The last name Costilla is characteristic of Latin America and the Caribbean, particularly Argentina, where it is quite a common surname, Peru, where it is quite a rare surname, and Mexico. Very seldom, Costilla is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Costilla | Spain, Mexico, United States, Peru, Argentina |
| antonio de mendoza y costilla PE (b. 1625) |
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| cristóbal hidalgo y costilla MX (b. 1713) |
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| manuel antonio jiménez de lobatón y costilla (b. 1723) |
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| manuel aulló y costilla (b. 1883) |
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jorge eduardo costilla sánchez Mexican drug lord, MX (b. 1971) |
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| juan garcía costilla Mexican politician, MX (b. 1943) |
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| fernando costilla Spanish television personality, ES (b. 1972) |
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| s costilla researcher |
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| jerónimo de costilla Spanish military personnel, ES |
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| margarita mora costilla Mora Costilla, Margarita |
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| melisa costilla researcher (ORCID 0000-0001-8078-7162) |
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