Mareuil-sur-Arnon (French pronunciation: [maʁœj syʁ aʁnɔ̃], literally Mareuil on Arnon) is a commune in the Cher department in the Centre-Val de Loire region of France.

A forestry and farming area comprising the village and several hamlets situated by the banks of the river Arnon, some 18 miles (29 km) southwest of Bourges, at the junction of the D18, D14 and the D87 roads. The commune shares its north-western border with the departement of Indre.

Historical population

Year	Pop.	±%
1962	869	—
1968	822	−5.4%
1975	715	−13.0%
1982	659	−7.8%
1990	611	−7.3%
1999	591	−3.3%
2008	579	−2.0%

• The church of St. Pierre, rebuilt in the nineteenth century.
• A watermill.
• The ruined towers of a feudal castle.

• Communes of the Cher department