Catabbio is a village in Tuscany, central Italy, administratively a frazione of the comune of Semproniano, province of Grosseto. At the time of the 2001 census its population amounted to 203.

Catabbio is about 65 km from Grosseto and 5 km from Semproniano, and it is situated along the Provincial Road which links Montemerano to Sovana. The village is divided into four hamlets: Casa Rigo, Santarello, Scalabrelli and Verziliani.

• Church of Sant'Anna, main parish church of the village, it is situated in the square of the main hamlet of Santarello.
• Church of Santa Lucia, little church in the hamlet of Scalabrelli, it contains a Renaissance stoup of 1574.
• Castle of Catabbio, old castle built by the Aldobrandeschi in the 12th century, it's now in ruins.

• 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 Editrice, 1999.

• Cellena
• Petricci
• Rocchette di Fazio
• Semproniano