The Canton of Castelsarrasin-1 was one of the 12 cantons of the arrondissement of Castelsarrasin, in the Tarn-et-Garonne department, in southern France. It had 6,299 inhabitants (2012).[1] It was disbanded following the French canton reorganisation which came into effect in March 2015. It consisted of part of the commune of Castelsarrasin,[1] which joined the new canton of Castelsarrasin in 2015.[2]