Carbonne (French pronunciation: [kaʁbɔn]; Occitan: Carbona) is a commune in the Haute-Garonne department in southwestern France.

Carbonne station on the Toulouse–Bayonne railway has rail connections to Toulouse, Pau and Tarbes.

It is situated at the confluence of the river Arize and the Garonne.

The commune is bordered by nine other communes: Longages to the north, Capens to the northeast, Marquefave to the east, Lacaugne and Latrape to the southeast, Rieux-Volvestre to the south, Salles-sur-Garonne to the southwest, Lafitte-Vigordane to the west, and finally by Peyssies to the northwest.

Agriculture based on the culture of cereals (maize, wheat, ...) still has an important place but tends to diminish in favour of residential zones, due to the proximity of the agglomeration of Toulouse.