Guayanilla (Spanish pronunciation: [ɡwaʝaˈniʎa], locally [waʝaˈniʎa]) is a town and municipality of Puerto Rico located on the southern coast of the island, bordering the Caribbean Sea, south of Adjuntas, east of Yauco; and west of Peñuelas and about 12 miles (19 km) west of Ponce.

Guayanilla grew quickly and was established as a separate municipality on February 27, 1833 by Governor Miguel de la Torre.

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 Guayanilla was 9,540.

The coastline forms the Guayanilla Bay, one of the best natural harbors in Puerto Rico, to the south, also.

The Yauco River briefly runs through the Boca borough, where its exit into the Caribbean Sea and accompanying marshlands are located.

The Guayanilla page lists Paseo Tablado Guayacán, Charco Los Peces, and Península del Río, as places of interest.

The Fiestas Patronales Inmaculada Concepcion de Maria is a religious and cultural celebration that generally features parades, games, artisans, amusement rides, regional food, and live entertainment.

[11] Other festivals and events celebrated in Guayanilla include: All municipalities in Puerto Rico are administered by a mayor, elected every four years.

The current mayor of Guayanilla is Raúl Rivera Rodríguez, of the New Progressive Party (PNP).

[35] The Nazario Collection, a set of inscribed stones discovered by Catholic priest and amateur archeologist José M. Nazario (and which popular culture links to Taíno chief Agüeybaná II), has become a cultural symbol for the municipality.

The statuettes serve as the center piece of Guayanilla's Father Nazario Museum of Lithic Epigraphy.