St. Thomas School, Leipzig (German: Thomasschule zu Leipzig Latin: Schola Thomana Lipsiensis) is a co-educational and public boarding school in Leipzig, Saxony, Germany. It was founded by the Augustinians in 1212 and is one of the oldest schools in the world.
St. Thomas is known for its art, language and music education. The Humanistic Gymnasium has a very long list of distinguished former students, including Richard Wagner (1813–1883) and many members of the Bach family, including Johann Sebastian Bach's son Carl Philipp Emanuel Bach (1714–1788).
From the 800-Year Anniversary Celebration in 2012 the Thomanerchor and St. Thomas School will be part of Forum Thomanum, an internationally oriented educational center.