Portuguese (português or, in full, língua portuguesa) is a West 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 in China. 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; in the Malacca state of Malaysia; and the ABC islands in the Caribbean where Papiamento is spoken, while Cape Verdean Creole is the most widely spoken Portuguese-based Creole. A Portuguese-speaking person or nation may be referred to as "Lusophone" in both English and Portuguese.

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 and lexicon. 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, Mercosur, OAS, ECOWAS and the African Union.

The Community of Portuguese Language Countries (in Portuguese Comunidade dos Países de Língua Portuguesa, with the Portuguese acronym CPLP) consists of the eight independent countries that have Portuguese as an official language: Angola, Brazil, Cape Verde, East Timor, Equatorial Guinea, Guinea-Bissau, Mozambique, Portugal and São Tomé and Príncipe.

Equatorial Guinea made a formal application for full membership to the CPLP in June 2010, a status given only to states with Portuguese as an official language. In 2011, Portuguese became its third official language (besides Spanish and French) and, in July 2014, the country was accepted as a member of the CPLP.

Portuguese is also one of the official languages of the Special Administrative Region of the People's Republic of China of Macau (alongside Chinese) and of several international organizations, including the Mercosur, the Organization of Ibero-American States, the Union of South American Nations, the Organization of American States, the African Union, the Economic Community of West African States, the Southern African Development Community and the European Union.