Limón (Spanish pronunciation: [liˈmon]), commonly known as Puerto Limón (Port Lemon in English), is a district, the capital city and main hub of Limón Province, as well as of the Limón canton in Costa Rica. It is the seventh largest city in Costa Rica, with a population of over 94,000, and is home to the Afro-Costa Rican community. Part of the community traces its roots to Italian, Jamaican and Chinese laborers who worked on a late nineteenth-century railroad project that connected San José to Puerto Limón. Until 1948, the Costa Rican government did not recognize Afro-Caribbean people as citizens and restricted their movement outside Limón province. As a result of this travel ban, this Afro-Caribbean population became firmly established in the region, which influenced decisions not to move even after it was legally permitted. Nowadays, there is a significant outflow of Limón natives who move to the country's Central Valley in search of better employment and education. The Afro-Caribbean community speaks Spanish and Limonese Creole, a creole of English.

Puerto Limón contains three port terminals, Moín Container Terminal, Port of Limón and Port of Moín, which permit the shipment of Costa Rican exports as well as the anchoring of cruise ships. In 2016, the government pledged ₡93 million ($166,000) for a new cruise ship terminal for Puerto Limón.

Health care is provided for the city by Hospital Dr. Tony Facio Castro. Two small islands, Uvita Island and Isla de Pájaros, are just offshore.