Tournan-en-Brie (French pronunciation: [tuʁnɑ̃ ɑ̃ bʁi] ⓘ, literally Tournan in Brie), or simply Tournan, is a commune in the Seine-et-Marne department in the Île-de-France region in north-central France.

The lordship of Tournan (French: seigneur de Tournan) was purchased from Jean II de Garlande by Pierre de Chambly, chamberlain of King Philip IV, in May 1293 and yielded by him to Charles, count of Valois, in October of the same year.

Tournan station is the terminus station of the RER E (previously 'EOLE') regional railway line starting from the Gare Saint Lazare in Paris.

Inhabitants of Tournan-en-Brie are called Tournanais in French.

This article related to a Seine-et-Marne location is a stub.