Grez-sur-Loing (French pronunciation: [gʁe syʁ lwɛ̃] , literally Grez on Loing; formerly Grès-en-Gâtinais, literally Grès in Gâtinais) is a commune in the Seine-et-Marne department in north-central France.

• The Church of Notre-Dame et Saint-Laurent (Church of Our Lady and of Saint Lawrence) was the church of a priory dependent on Saint Peter's Abbey in Sens. It dates from the twelfth century and houses some tombs of the sixteenth century.
• The Tower of Ganne, built by Louis VI the fat in 1127, at the same time as the castle.
• The Old bridge, former bridge of Grez-en-Gâtinais built between the 12th century and the 14th century. Destroyed several times it was rebuilt identically in 1980.
• Tacot des Lacs (Lakes' crate), a narrow-gauge heritage railway running about lakes on plains of the Loing river.

• Sights
• 
  Grez sur Loing.
• 
  Ganne Towwer
• 
  Church of Our Lady and Saint Lawrence.

It is located 70 km south of Paris and is notable for the artists and musicians who have lived or stayed there. The painter Fernande Sadler became mayor and encouraged the community gathering paintings and she wrote about the artists there.

The Swedish artist Carl Larsson met his wife Karin Bergöö while they were both staying at Grez. Others include Irish artist Frank O'Meara, Swedish artists Karl Nordström, Emma Chadwick, Julia Beck and Bruno Liljefors as well as writer August Strindberg, the Danish and Norwegian members of the Skagen Painters, and Robert Louis Stevenson. American artists were John Singer Sargent, Francis Brooks Chadwick, Robert Vonnoh, Edward Simmons (painter), Will Hicox Low, Theodore Robinson, Willard Metcalf, Bruce Crane, and Kenyon Cox. Grez is featured in many paintings by The Glasgow Boys, where the bridge over the river is clearly featured. They were resident in the village at the turn of the 20th century.

Musicians also migrated to Grez-sur-Loing. The English composer Frederick Delius lived here and dictated a number of works to his amanuensis, Eric Fenby, here. Their house was portrayed in the 1968 Ken Russell film Song of Summer, but it was filmed in England. Delius died in Grez on 10 June 1934. The American soprano and folk song fieldworker Loraine Wyman spent several years here starting in 1928, following her retirement from singing.

• Communes of the Seine-et-Marne department

• 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)