The arrondissement of Saint-Germain-en-Laye is an arrondissement of France in the Yvelines department in the Île-de-France region.

[2] Its population is 527,408 (2021), and its area is 350.9 km2 (135.5 sq mi).

[3] The communes of the arrondissement of Saint-Germain-en-Laye, and their INSEE codes, are:[2] The arrondissement of Saint-Germain-en-Laye was created in 1962 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 Saint-Germain-en-Laye were, as of January 2015:[7]