The arrondissement of Saint-Lô is an arrondissement of France in the Manche department in the Normandy region.

[2] Its population is 103,820 (2021), and its area is 1,277.3 km2 (493.2 sq mi).

[3] The communes of the arrondissement of Saint-Lô, and their INSEE codes, are:[2] The arrondissement of Saint-Lô was created in 1800.

[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 Saint-Lô were, as of January 2015:[6]