Chocó Department (Spanish pronunciation: [tʃoˈko]) is a department of the Pacific region of Colombia known for hosting the largest Afro-Colombian population in the nation, and a large population of Amerindian and mixed African-Amerindian Colombians. It is in the west of the country, and is the only Colombian department to have coastlines on both the Pacific Ocean and the Atlantic Ocean. It contains all of Colombia's border with Panama. Its capital is Quibdó.
Chocó has a diverse geography, unique ecosystems and unexploited natural resources; however, its population has one of the lowest standards of living of all departments in Colombia. A major factor cited by the government is the rugged, montane rainforest environment and the hot, hyperhumid climate. These factors have limited any significant infrastructure improvements to the region, and Chocó remains one of the most isolated regions of Colombia, with no major transportation infrastructure built since initial foundations were laid down in 1967 for a highway connecting Chocó with the city of Medellín.