The arrondissement of Châlons-en-Champagne is an arrondissement of France in the Marne department in the Grand Est region.

[2] Its population is 107,923 (2021), and its area is 2,612.4 km2 (1,008.7 sq mi).

[3] The communes of the arrondissement of Châlons-en-Champagne, and their INSEE codes, are:[2] The arrondissement of Châlons-en-Champagne 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 Châlons-en-Champagne were, as of January 2015:[6]