Porrona is a village in Tuscany, central Italy, administratively a frazione of the comune of Cinigiano, province of Grosseto. At the time of the 2001 census its population amounted to 24.

Porrona is about 40 km from Grosseto and 4 km from Cinigiano, and it is situated along the road which links the Cipressino Provincial Road at Sant'Angelo Scalo to Cinigiano.

The village was born in the 13th century as a castle of the Republic of Siena. It has become the seat of notable Sienese families since the 14th century (Piccolomini, Tolomei).

• Pieve of San Donato (13th century), main parish church of the village, it is a notable Romanesque architecture.
• Madonna delle Grazie (17th century), it was built as a chapel outside the walls.
• Castle of Porrona (13th century), ancient Sienese building, it was re-built in the 16th century after the annexation to the Grand Duchy of Tuscany. It was then restructured with Gothic Revival elements in the early 20th century.
• Walls of Porrona, old fortifications which surround the village since 13th century.

• (in Italian) Emanuele Repetti, «Porrona», Dizionario Geografico Fisico Storico della Toscana, 1833–1846.
• Bruno Santi, Guida storico-artistica alla Maremma. Itinerari culturali nella provincia di Grosseto, Siena, Nuova Immagine, 1995, p. 175-178.
• Aldo Mazzolai, Guida della Maremma. Percorsi tra arte e natura, Florence, Le Lettere, 1997.
• Giuseppe Guerrini, Torri e castelli della provincia di Grosseto, Siena, Nuova Immagine, 1999.

• Borgo Santa Rita
• Castiglioncello Bandini
• Monticello Amiata
• Poggi del Sasso
• Sasso d'Ombrone