Arzon (French pronunciation: [aʁzɔ̃]) or Arzhon-Rewiz in Breton (Breton pronunciation: [aʁxɔ̃n rewis]) is a commune located at the extremity of the Rhuys peninsula in the Morbihan department in the Brittany region in northwestern France.

Arzon is said to be the French village with the longest coastal area in France (see map). Arzon marks the east entrance to the Gulf of Morbihan.

There are two seaside resorts in the commune:

• Port-Navalo (Porzh Noalou Breton pronunciation: [pɔʁx nœa'lœɥ]), dating from the nineteenth century
• Le Crouesty (Ar C'hroesti Breton pronunciation: [œr xʁœes'tɛj]), in constant development since the 1970s

Several hamlets are located on the territory of the commune: Monteno, Kerners, Béninze, Tumiac, Kerjouanno.

Arzon is a popular summer resort. In winter, fall and spring, only two "gendarmes" (French military police) work in Arzon, but in the summer there are far more to cope with the influx of tourists.

Historical population

Year	Pop.	±% p.a.
1968	1,308	—
1975	1,326	+0.20%
1982	1,476	+1.54%
1990	1,754	+2.18%
1999	2,056	+1.78%
2007	2,173	+0.69%
2012	2,103	−0.65%
2017	2,073	−0.29%
Source: INSEE

Inhabitants of Arzon are called Arzonais in French.

Arzon is twinned with Lahinch, Ireland.

• Communes of the Morbihan department

• Arzon Town Hall
• Arzon Tourist Office
• Yacht Club Crouesty Arzon
• Base Mérimée: Search for heritage in the commune, Ministère français de la Culture. (in French)