Arz may refer to:
The Arz is a 66.5 km (41.3 mi) long river in the Morbihan département, northwestern France. Its source is at Plaudren. It flows generally east-southeast. It is a right tributary of the Oust into which it flows at Saint-Jean-la-Poterie, near Redon.
This list is ordered from source to mouth: Plaudren, Monterblanc, Elven, Le Cours, Larré, Molac, Pluherlin, Malansac, Saint-Gravé, Peillac, Saint-Jacut-les-Pins, Saint-Vincent-sur-Oust, Allaire, Saint-Perreux, Saint-Jean-la-Poterie
Île d'Arz is an archipelago of nine islands and is a commune in the Morbihan department in Brittany in north-western France, only 6 kilometers to the south-west of Vannes.
It is located in the Gulf of Morbihan. Île d'Arz and Île-aux-Moines are the only two islands of the gulf that are also communes.
Inhabitants of Île-d'Arz are called Iledarais.
At the census of 1999, the island had a population of 231. On 1 January 2006, the estimate was 254. Currently, there are 260 residents on the main island during winter, and the population goes as high as 2,500 during summer. The main island contains 550 houses, 30% of which are residential.
There is one hotel open during the summer on the island and one residential hotel open during the whole year. There are two rural gîtes open the whole year. There is also one campsite which opens during the summer.
There is one mason, one carpenter, one professional painter, and one farmer.
There is one bus service between the town and the port, three passenger boats which travel between the archipelago and Vannes and one merchandise ship which follows the same trajectory