Moret-sur-Loing (French pronunciation: [mɔʁɛ syʁ lwɛ̃], literally Moret on Loing) is a former commune in the Seine-et-Marne department located at the Île-de-France region in north-central France. It is situated along the confluence of rivers Loing and Seine. Moret–Veneux-les-Sablons station has rail connections to Montargis, Melun, Montereau-Fault-Yonne, Laroche-Migennes and Paris.

On 1 January 2015, Moret-sur-Loing and Écuelles have merged becoming one commune called Orvanne. It merged once again into the new commune called Moret-Loing-et-Orvanne on 1 January 2016.

The town was a source of inspiration for Monet, Renoir and Sisley.

Inhabitants of Moret-sur-Loing are called Morétains.

Moret-sur-Loing is twinned with:

• Kilkenny, County Kilkenny, Ireland
• Külsheim, Baden-Württemberg, Germany

• Château de Moret
• Communes of the Seine-et-Marne department

• Alfred Sisley, painter, lived and died in Moret
• Sarah Tyson Hallowell, art curator, lived and died in Moret
• Harriet Hallowell, artist, lived and died in Moret
• Eliza Pratt Greatorex (1819–1897), American artist lived and died in Moret ("Les remparts", Rue des Fossés)
• Karl Cartier, (1855–1925), French painter.
• Marina Tsvetaïeva, Russian poet
• Prudent Pohl said Zanaroff, (1885–1966) painter
• George Grey Barnard, (1863–1938), sculpteur and collector of medieval art had his atelier from 1903 to 1911 in Moret

• Official site (in French)
• 1999 Land Use, from IAURIF (Institute for Urban Planning and Development of the Paris-Île-de-France région) (in English)
• Base Mérimée: Search for heritage in the commune, Ministère français de la Culture. (in French)