CHATILLON, an arrondissement in the department of Côte d'Or, in France. It extends over 820 square miles, and is divided into six cantons, and these into 116 communes, containing 48,170 inhabitants. The chief place, which is of the same name, but, to distinguish it, has the addition "sur Seine," contains a population of 3900 persons. It carries on a moderate trade in cloth, serges, hosiery, and cotton spinning. Long. 4. 23. E. Lat. 47. 23. N.