239 (Russian: Президентский физико-математический лицей №239), is a public high school in Saint Petersburg, Russia that specializes in mathematics and physics.

It is the alma mater of numerous winners of International Mathematical Olympiads and it has produced many notable alumni.

Originally, it was located in the Lobanov-Rostovsky Palace, also known as "house with lions" at the corner of Saint Isaac's Square and Admiralteysky Prospect.

Finally, in 1975 the school relocated to its current location, into the historic Annenschule building.

The first of January 2014 the school received a status of "Presidential Physics and Mathematics Lyceum №239".