The arrondissement of Blois (French: arrondissement de Blois, [aʁɔ̃dismɑ̃ də blwa]) is an arrondissement (district) of France, located in the Loir-et-Cher department, Centre-Val de Loire.

[2] Its population is 151,096 (2021), and its area is 1,950.2 km2 (753.0 sq mi).

[4] In 2007 it lost the canton of Saint-Aignan to the arrondissement of Romorantin-Lanthenay.

[5] In January 2019 it lost the commune Courmemin to the arrondissement of Romorantin-Lanthenay.

[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.