Aveyron is a department in the region of Occitania, Southern France. It was named after the river Aveyron. Its inhabitants are known as Aveyronnais (masculine) or Aveyronnaises (feminine) in French. The inhabitants of Aveyron's prefecture, Rodez, are called Ruthénois, based upon the first Celtic settlers in the area, the Ruteni. With an area of 8,735 square kilometres (3,373 sq mi) and a population of 279,595, Aveyron is a largely rural department with a population density of 32 per square kilometer.

In the administrative divisions of France, the department is one of the three levels of government under the national level, between the administrative regions and the communes. Ninety-six departments are in metropolitan France, with an additional five constituting overseas departments, which are also classified as overseas regions. Departments are further subdivided into 333 arrondissements and 2,054 cantons. These last two levels of government have no political autonomy, instead serving as the administrative basis for the local organisation of police, fire departments as well as, in certain cases, elections.