Villalba (Sicilian: Villarba) is a comune (municipality) in the Province of Caltanissetta in the Italian region Sicily, located about 51 kilometres (32 mi) northwest of Caltanissetta, about 98 kilometres (61 mi) southeast of Palermo and 68 km from Agrigento.

The Sagra del Pomodoro (tomato festival) is held every year in the month of August.

Villalba borders the following municipalities: Cammarata, Castellana Sicula, Marianopoli, Mussomeli, Petralia Sottana, Polizzi Generosa, Vallelunga Pratameno.

In 1751, it was acquired by Nicolò Palmieri Calafato, who also obtained the approval to populate the area.

Noteworthy is the Palace of baron Nicolò Palmieri Morillo, built during the 18th century.