Châtillon (French: [ʃatijɔ̃] ⓘ; Valdôtain: Tschahtéyón; Issime Walser: Géschtullju); is a town and comune in the Aosta Valley region of northwestern Italy.

Châtillon was renamed "Castiglion Dora" in Italian in 1939 during Fascist rule in Italy.

Châtillon is the ancestral home of the Bich family, whose most famous member was Marcel Bich, founder of Société Bic.

Albard, Bellecombe, Breil-de-Barrel (or Petit-Breil), Gros-Breil, Bourg, Brusoncles, Brusoncles-des-Gard (or Brusoncles-Dessus), Brusoncles-des-Janin (or Brusoncles-Dessous), Barme-des-Antesans, Cret-de-Breil, Grange-de-Barme, Chaméran, Champlong, Fours, Ventoux, Garin, Sez-de-Val, La Fournaise, Conoz, La Verdettaz, Murate, Isseuries, Perrianaz, Chardin, Promiod, Boëttes, Francou, Arsine, Brenvey, Chancellier, Revard, Bioure, Salère, Varé, Chenez, Pointé, Étavé, Chésalet, Toniquet, Assert, Fressoney, Nissod, Travod, Domianaz, Closel, La Tour, Verlex, La Sounère, Barmusse, Crétadonaz, Cret-Blanc, Chavod, Merlin, Tour-de-Grange, Sarmasse, Barmafol, Plantin, Perolles, Soleil, Bretton, Saint-Valentin, Sellotaz, Govergnou, Cillod, Panorama, Remela, Neran, Larianaz, Gléréyaz, La Marca, Crétaz, Cloîtres, Plan-Pissin, Tornafol, Saint-Clair, Piou, Cérouic, Étrop, Pragarin, Salé, Les Îles, Les Pérolles, Taxard, Ussel, Château-d'Ussel, Biolasse, Perry, Mont Ross, Toule.

This article on a location in Aosta Valley is a stub.