Pigna is the 9th rione of Rome, Italy, identified by the initials R. IX, and belongs to the Municipio I. The name means "pine cone" in Italian, and the symbol of the rione is the colossal bronze pine cone standing in the middle of the homonymous fountain. The fountain, which was initially located in the Baths of Agrippa, now decorates a vast niche in the wall of the Vatican facing the Cortile della Pigna, located in Vatican City.

Municipio I is an administrative subdivision of the municipality of Rome, encompassing the centre of the city.