The Nantes tram-train (French: Tram-train de Nantes) is a tram-train network operating in the French city of Nantes and the surrounding region.

The Nantes to Châteaubriant railway line was part of a former Nantes to Rennes railway route which originally opened in 1877.

The Nantes to Châteaubriant section closed to passenger traffic in 1980 and to freight in 2008.

[1] Approval to modernise this line received approval in 2009;[2] and in 2014, the line reopened for exclusive use of the Nantes tram-train network, becoming the second line to operate after an existing line to Clisson opened in 2011, sharing track with mainline trains.