Pigna (Italian: [ˈpiɲɲa]) is the 9th rione of Rome, Italy, identified by the initials R. IX, and belongs to the Municipio I.

In the Roman period, the giant bronze pigna that gives the name to the rione once decorated a fountain and the water flowed copiously from the top of the pine cone.

The Pigna was moved first to the Old Basilica of Saint Peter, where Dante saw it and employed it in the Divina Commedia as a simile for the giant proportions of the face of Nimrod.

There it stands today under Pirro Ligorio's vast niche at the far end, flanked by a pair of Roman bronze peacocks brought from Hadrian's mausoleum, the Castel Sant'Angelo.

Eastward, it borders with Trevi (R. II), from which is separated by Via del Corso and Piazza Venezia.