Sassofortino is a village in Tuscany, central Italy, administratively a frazione of the comune of Roccastrada, province of Grosseto. At the time of the 2001 census its population amounted to 815.

Sassofortino is a hilly medieval village situated about 33 km from Grosseto and 8 km from Roccastrada.

• San Michele Arcangelo (14th century), main parish church of the village. It was restructured in 1893.
• Castle of Sassoforte, an 11th-century fortress, now in ruins.

• Aldo Mazzolai, Guida della Maremma. Percorsi tra arte e natura, Le Lettere, Florence, 1997.
• Giuseppe Guerrini, Torri e castelli della Provincia di Grosseto, Nuova Immagine Editrice, Siena, 1999.

• Montemassi
• Piloni
• Ribolla
• Roccatederighi
• Sticciano
• Torniella