Lycée Chaptal, High school in France

Lycée Chaptal is a prestigious secondary school located in the 8th arrondissement of Paris, France.

Prosper Goubaux opened the school in 1844 as the Institution Saint-Victor between Rue Blanche and Rue de Clichy, teaching commerce and industry rather than the classics. Renamed Collège Chaptal in 1848 when the City of Paris took it over, it moved to Boulevard des Batignolles, where Eugène Train's buildings went up from 1866 to 1876, interrupted by the war of 1870-71. It became a lycée in 1950.

Pupils are called "Chaptaliens", and an alumni association founded in 1854 still runs today, connecting former and current students and funding personal projects. The school's most prestigious room, now used for meetings and exams and formerly a drawing room, and a nearby square have borne founder Prosper Goubaux's name since 1993; three busts of him are kept inside.

The school stands at 45 boulevard des Batignolles in the 8th arrondissement, separated from the Saint-Lazare railway tracks by the rue de Rome; the Rome and Villiers metro stations serve it. The main entrance and the administration occupy the boulevard side. The buildings are inscribed as monuments historiques, and the physics and chemistry museum opens mainly during the annual Fête de la science.

The school keeps a museum of 19th-century physics and chemistry instruments, normally closed to the public but opened for temporary exhibitions, notably during the annual Fête de la science. Its alumni association, founded in 1854, is still active and can give students financial support for personal projects.