The Warsaw Lyceum (Polish: Liceum Warszawskie; German: Königlich-Preußisches Lyzäum zu Warschau) was a secondary school that existed in Warsaw, under the Kingdom of Prussia and under the Kingdom of Poland, from 1804 to its closing in 1831 by Imperial Russia following the Polish November 1830 Uprising.
The Warsaw Lyceum was founded in 1804 by the Kingdom of Prussia as a German language school in Warsaw as part of its Germanization efforts, which had become part of New East Prussia following the 1795 Third Partition of the Polish-Lithuanian Commonwealth.
Already in the Second Partition of the Polish-Lithuanian Commonwealth (1793), Prussia had acquired South Prussia, and had established a branch of their Cadet Corps schools in Kalisch. In 1804, in Warsaw, a humanistic secondary school for boys was opened, divided according to the Prussian educational model into six classes, plus two preparatory ones. In German, it taught Latin, Greek, German and French, philosophy, ethics, mathematics and natural sciences, and (in Polish) the Polish language.
Samuel Linde was appointed director of the Warsaw Lyceum. The Evangelical-Augsburg Lutheran from Thorn in Royal Prussia had studied theology and philology at the University of Leipzig, and had taught Polish there. From 1795 he had been librarian to Józef Maksymilian Ossoliński, and had gathered material for his future dictionary of the Polish language, Słownik języka polskiego, a six-volume monolingual dictionary which he published in Warsaw in 1807–14. Linde faced difficulties in organizing the school, with Prussian authorities insisting that the facility should serve Germanization.