The arrondissement of Langon is an arrondissement of France in the Gironde department in the Nouvelle-Aquitaine region.

[2] Its population is 134,250 (2021), and its area is 2,644.3 km2 (1,021.0 sq mi).

[4] At the May 2006 reorganisation of the arrondissements of Gironde, it gained the cantons of Cadillac and Podensac from the arrondissement of Bordeaux.

[4][5] As a result of the reorganisation of the cantons of France which came into effect in 2015, the borders of the cantons are no longer related to the borders of the arrondissements.

The cantons of the arrondissement of Langon were, as of January 2015:[6]