Lycée Jean-Baptiste-Say, Educational institution in France

Lycée Jean-Baptiste-Say is a public collège and lycée at 11 bis, rue d'Auteuil in the 16th arrondissement, with three scientific preparatory classes (PSI, PT, BCPST). Its central pavilion, the former hôtel Galpin or château Ternaux, is one of the last private mansions of Auteuil; the school wraps around it with buildings erected from 1882 to 1897 on plans by architect Germain Sallard. The site has three playgrounds, a small square, an amphitheatre and classrooms numbered 1 to 77.

The central pavilion, the hôtel Galpin, was built in the early 18th century and bought in 1804 by wool industrialist Étienne Ternaux-Rousseau, who renamed it château Ternaux. In 1852 abbé Lévêque installed the Catholic Institution Notre-Dame there, which closed in 1870. The city of Paris bought the building in 1872 and Octave Gréard set up the École normale d'instituteurs de Paris, inaugurated in the presence of minister Jules Simon; the neighbouring école primaire supérieure took the name Jean-Baptiste Say in 1875-1876. The state lycée was created in 1953.

Students are called "Sayens", and since 1954 most classrooms have been named after notable figures, including former pupils who joined the Resistance, scientists and writers. Pupils have run a school newspaper: Sayen Libéré appeared in May 2017, was replaced by Le Sayen in October 2019, and went fully digital in November 2020.

The school is at 11 bis rue d'Auteuil, in the 16th arrondissement, near Métro Michel-Ange – Auteuil (lines 9 and 10) and Église d'Auteuil (line 10). The listed parts are the façade on the first courtyard, at 9 rue du Buis – 11 bis rue d'Auteuil, and the interiors of the grand salon and the headteacher's office. As a working school, visits are not open to the public.

The school appears in several films and TV series, including Le Pion (1978), LOL (2009) and The Round Up (2010), and since 2010 in the series Clem. Its central pavilion, the former hôtel Galpin, is one of the last private mansions of Auteuil.