| Costa | |
|---|---|
Place of origin | Italy, Spain, Portugal, France, Malta |
| Distinctions | "da Costa", "de Costa", "e Costa" |

Costa (Italian: [ˈkɔsta], Portuguese: [ˈkɔʃtɐ, ˈkɔstɐ],Spanish: [ˈkosta], is an Italian, Spanish, Portuguese, French, and Maltese mostly toponymic surname. The surname spread throughout the world through colonization. It was also a surname chosen by former Jews due to Roman Catholic and other Christian (often forced) conversions.
In Italy, Portugal, Galicia and Catalonia, it is derived from the Latin word costa, "rib", which has come to mean slope, coast (close to the sea, or coastline locations) in Romance languages. In Spain, it originates from Catalonia or Galicia, with the Spanish (Castilian) equivalent being Cuesta.

As of 2014, 71.0% of all known bearers of the surname Costa were residents of Brazil (frequency 1:141), 7.6% of Portugal (1:67), 5.2% of Mozambique (1:255), 3.7% of Italy (1:801), 2.4% of the United States (1:7,460), 1.9% of Guinea-Bissau (1:44), 1.5% of Spain (1:1,531), 1.2% of East Timor (1:49) and 1.2% of Argentina (1:1,809).
In Brazil, the frequency of the surname was higher than the national average (1:141) in the following states:
In Italy, the frequency of the surname was higher than the national average (1:801) in the following regions:
In Spain, the frequency of the surname was higher than the national average (1:1,531) in the following autonomous communities: