Réau (French pronunciation: [ʁeo] ^ⓘ) is a commune in the Seine-et-Marne department in the Île-de-France region in north-central France.

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Réau
Commune
The town hall in Réau
Location of Réau
Réau Show map of France Réau Show map of Île-de-France (region)
Coordinates: 48°37′17″N 2°37′23″E
Country	France
Region	Île-de-France
Department	Seine-et-Marne
Arrondissement	Melun
Canton	Combs-la-Ville
Intercommunality	CA Grand Paris Sud Seine-Essonne-Sénart
Government
• Mayor (2020–2026)	Alain Auzet[1]
Area 1	13.32 km2 (5.14 sq mi)
Population  (2021)[2]	1,966
• Density	150/km2 (380/sq mi)
Time zone	UTC+01:00 (CET)
• Summer (DST)	UTC+02:00 (CEST)
INSEE/Postal code	77384 /77550
Elevation	82–94 m (269–308 ft)
1 French Land Register data, which excludes lakes, ponds, glaciers > 1 km2 (0.386 sq mi or 247 acres) and river estuaries.

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Around 1881, sugar beet producer Arthur Brandin invested in a Decauville railway with eight horse-drawn tipping lorries for the Ferme de Galande near Réau, 15 km east of the Decauville factory in Petit Bourg. As well as being a sugar beet farmer, he was also mayor of Réau and Republican Consul of the Canton of Brie-Comte-Robert from 1895 to 1912. The surface soil of his sugar beet fields consisted of clay in which fragments of siliceous sandstone were embedded, used for millstones and structural purposes. The subsoil was limestone, so the fields were often very muddy at harvest time until Brandin installed an innovatively designed drainage system.^[4]

The inhabitants are called Réaltais.

• Communes of the Seine-et-Marne department