Lésigny (French pronunciation: [leziɲi] ⓘ) is a commune in the Seine-et-Marne département in the Île-de-France region in the south-eastern suburbs of Paris, France.

The town is well known for its affluence and for the Château de Grande Romaine, which hosted the Brazil national football team during FIFA World Cup 1998, as well as famous European football teams such as Paris Saint-Germain FC, Olympique de Marseille, AS Monaco FC and Chelsea FC.

Lésigny is 22 km to the east of Paris in the department of Seine-et-Marne.

Its American character was augmented by the presence of a private swimming pool and tennis court.

[5] Due to this development, the population of the commune sharply increased from 362 in 1968 to 6,572 in 1975.