Lycée Janson-de-Sailly is a lycée located in the 16th arrondissement of Paris, France. The lycéens of Janson are called les jansoniens and they usually refer to their high school as Janson, or JdS. It is the biggest academic institution in the region: 3,200 boys and girls from 11 to 20 attend classes ranging from junior high school to Classes Préparatoires.

The 16th arrondissement of Paris is the westernmost of the 20 arrondissements of Paris, the capital city of France. Located on the Right Bank, it is adjacent to the 17th and 8th arrondissements to the northeast, as well as to Boulogne-Billancourt, Hauts-de-Seine to the southwest. Opposite the Seine are the 7th and 15th arrondissements.