Map - Juana Díaz, Puerto Rico (Juana Díaz Municipio)

Juana Díaz is a town and municipality of Puerto Rico located in the southern coast of the island, south of Jayuya, Ciales, Orocovis and Villalba; east of Ponce; and west of Coamo and Santa Isabel and the Caribbean Sea to the south. Juana Díaz is spread over 13 barrios and Juana Diaz Pueblo (the downtown area and the administrative center of the city). It is part of the Ponce Metropolitan Statistical Area.

Juana Díaz is known as "La Ciudad del Mabí" (Mabí City). Mabi is a fermented Taíno beverage made out from the bark of the mabi tree Colubrina elliptica.

Juana Díaz was founded in 1798 and was known as Ciudad de Jacagua, in honor of the Taíno Cacique Jacaguax. The civil government of this territory was established on April 25, 1798.

Puerto Rico was ceded by Spain in the aftermath of the Spanish–American War under the terms of the Treaty of Paris of 1898 and became a territory of the United States. In 1899, the United States Department of War conducted a census of Puerto Rico finding that the population of Juana Díaz was 27,896.

On September 20, 2017 Hurricane Maria struck the island of Puerto Rico. In Juana Díaz, 2,500 homes lost their roof.