Lycée Louis-le-Grand, High school in Paris, France

Lycée Louis-le-Grand is a public secondary and higher-education lycée at 123 rue Saint-Jacques in Paris's 5th arrondissement. Its present buildings, rebuilt from 1885 to 1888, face the Sorbonne across the street and the Collège de France to the north. It houses both a high school and classes préparatoires in the sciences, business and humanities.

Guillaume Duprat, bishop of Clermont, invited the Jesuits to his Paris mansion in 1550 and left an endowment at his death in 1560; they bought an estate on rue Saint-Jacques and began teaching there in 1563 as the Collège de Clermont. Renamed Collège de Louis le Grand in 1682 under Louis XIV's patronage, it took the name lycée Louis-le-Grand in 1873, and its present buildings date from a reconstruction of 1885-1888.

Students are called magnoludoviciens, from the Latin Ludovicus Magnus for Louis XIV, and the school goes by LLG. Its alumni include four French presidents, nine Fifth Republic prime ministers, eight Nobel laureates and six Fields Medalists.

The school stands at 123 rue Saint-Jacques, bordered by rue Cujas to the south and impasse Chartière to the east, facing the Sorbonne across the street. It teaches a high school curriculum plus preparatory classes in the sciences, business and humanities.

The school's students are called magnoludoviciens, from the Latin Ludovicus Magnus, the nickname of Louis XIV. Its alumni include four French presidents, nine prime ministers of the Fifth Republic, eight Nobel laureates and six Fields Medalists.