Île d'Arz is an island and commune in the Morbihan department in Brittany in north-western France. 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. As of the census of 1999, the island had a population of 231. On 1 January 2006, the estimate was 254.

• Telefoon +(0)2 97 44 44 40
• E-mail -
• Adress avenue Maréchal Juin Maréchal de France | Île-d'Arz, 56840 Vannes-Ouest
• Website http://www.iledarz.fr