Château-Landon (French pronunciation: [ʃɑto lɑ̃dɔ̃] ⓘ) is a commune in the Seine-et-Marne department in the Île-de-France region in north-central France.

The commune contains the Souppes-sur-Loing quarry, where the bright white travertine stones for the construction of the Sacré-Cœur, Paris, were sourced.

Formerly the seat of the canton of Château-Landon, it has been part of the canton of Nemours since 2015.

The inhabitants are called Chatellandonnais or Castellandonnais in French.

This article related to a Seine-et-Marne location is a stub.