Portuguese (português or, in full, língua portuguesa) is a Romance language and the sole official language of Portugal, Brazil, Cape Verde, Guinea-Bissau, Mozambique, Angola, and São Tomé and Príncipe. It also has co-official language status in East Timor, Equatorial Guinea and Macau. As the result of expansion during colonial times, a cultural presence of Portuguese and Portuguese creole speakers are also found in Goa, Daman and Diu in India; in Batticaloa on the east coast of Sri Lanka; in the Indonesian island of Flores; and in Malacca in Malaysia.

Portuguese is part of the Ibero-Romance group that evolved from several dialects of Vulgar Latin in the medieval Kingdom of Galicia, and has kept some Celtic phonology. With approximately 215 to 220 million native speakers and 260 million total speakers, Portuguese is usually listed as the sixth most natively spoken language in the world, the third-most spoken European language in the world in terms of native speakers, and a major language of the Southern Hemisphere. It is also the most spoken language in South America and the second-most spoken in Latin America after Spanish, and is an official language of the European Union, Mercosul, OAS, ECOWAS and the African Union.

Spanish author Miguel de Cervantes once called Portuguese "the sweet and gracious language" and Spanish playwright Lope de Vega referred to it as "sweet", while the Brazilian writer Olavo Bilac poetically described it as a última flor do Lácio, inculta e bela (the last flower of Latium, rustic and beautiful). Portuguese is also termed "the language of Camões", after one of the greatest literary figures in the Portuguese language, Luís Vaz de Camões.

In March 2006, the Museum of the Portuguese Language, an interactive museum about the Portuguese language, was founded in São Paulo, Brazil, the city with the greatest number of Portuguese language speakers in the world. The museum is the first of its kind in the world.  In 2015 the museum was destroyed in a fire, but there are plans to reconstruct it.