Arthon-en-Retz (French pronunciation: [aʁtɔ̃ ɑ̃ ʁɛ], literally Arthon in Retz; Breton: Arzhon-Raez) is a former commune in the Loire-Atlantique department in western France. On 1 January 2016, it was merged into the new commune of Chaumes-en-Retz. Arthon-en-Retz is situated 10 km east of Pornic, 39 km west of Nantes and 41 south of Saint-Nazaire.

The inhabitants are called Arthonnais.

Historical population

Year Pop. ±% 1793 1,661 —     1800 1,255 −24.4% 1806 2,093 +66.8% 1821 1,681 −19.7% 1831 1,797 +6.9% 1836 1,724 −4.1% 1841 1,748 +1.4% 1846 1,992 +14.0% 1851 2,103 +5.6% 1856 2,130 +1.3% 1861 2,242 +5.3% 1866 2,352 +4.9% 1872 2,304 −2.0% 1876 2,367 +2.7% 1881 2,354 −0.5% 1886 2,276 −3.3% 1891 2,319 +1.9% 1896 2,354 +1.5%

Year Pop. ±% 1901 2,361 +0.3% 1906 2,494 +5.6% 1911 2,425 −2.8% 1921 2,142 −11.7% 1926 2,014 −6.0% 1931 1,943 −3.5% 1936 1,889 −2.8% 1946 1,766 −6.5% 1954 1,793 +1.5% 1962 1,889 +5.4% 1968 1,948 +3.1% 1975 1,933 −0.8% 1982 2,151 +11.3% 1990 2,321 +7.9% 1999 2,668 +15.0% 2006 3,240 +21.4% 2009 3,629 +12.0% 2013 4,031 +11.1%

• Mickaël Landreau - footballer (Lille OSC)
• Anthony Charteau - cyclist

• Communes of the Loire-Atlantique department