Calabozo, or Calaboso, an inland town of Venezuela, once capital of the province of Caracas in the colonial period, and now capital of the state of Guárico. Pop. (1891) 5618. Calabozo is situated in the midst of an extensive llano on the left bank of the Guárico river, 325 ft. above sea-level and 123 m. S.S.W. of Caracas. The plain lies slightly above the level of intersecting rivers and is frequently flooded in the rainy season; in summer the heat is most oppressive, the average temperature being 88°F. The town is regularly laid out with streets crossing at right angles, and possesses several fine old churches, a college and public school. It is also a bishop's see, and a place of considerable commercial importance because of its situation in the midst of a rich cattle-raising country. It is said to have been an Indian town originally, and was made one of the trading stations of the Compañia Guipuzcoana in 1730. However, like most Venezuelan towns, Calabozo made little growth during the 19th century.

In 1820 the Spanish forces under Morales were defeated here by the revolutionists under Bolívar and Paez.