The arrondissement of Pontoise is an arrondissement of France in the Val-d'Oise department in the Île-de-France region.

[2] Its population is 349,407 (2021), and its area is 766.0 km2 (295.8 sq mi).

[3] The communes of the arrondissement of Pontoise, and their INSEE codes, are:[2] The arrondissement of Pontoise was created in 1800 as part of the department Seine-et-Oise.

[6] 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 Pontoise were, as of January 2015:[7]