The Portugués Dam (Spanish: Represa Portugués) is a 220 feet (67 m) high and 1,230 feet (370 m) long single-centered roller-compacted concrete thick arch dam on the Portugués River, three miles (5 km) northwest of the city Ponce, in Barrio Tibes, Ponce, Puerto Rico.

Containing 367,000 cubic yards (281,000 m3) of roller-compacted concrete, it is 110 feet (34 m) thick at its base and 35 feet (11 m) thick at its crest. The dam has an uncontrolled spillway center-left side, over the river bed; 21 ft (6.4 m) below the dams crest of 534.6 ft (162.9 m) above sea level. The center of the dam straddles an intake and outlet structure which will draw water from behind the dam and discharge it into the river valley.

The primary purpose of the dam is flood control, it provides flood protection for 40,000 people and over 13,000 residential structures. The dam is the final component of the Portugués and Bucana Flood Protection Project and the first dam of its type constructed by the U.S. Army Corps of Engineers in the United States or Caribbean. It is the first dam ever built in the United States that uses the single-centered roller-compacted concrete thick arch technique.

The dam was structurally completed in December 2013 and inaugurated on 5 February 2014. The dam is operated by the Puerto Rico Department of Natural and Environmental Resources.