The Gymnasium Christianeum is a famous former Latin school (German: Lateinschule) in Hamburg, northern Germany.

Founded in 1738 by King Christian VI of Denmark, it is now housed in a building planned by Danish designer Arne Jacobsen.

The first Latin school here was founded as early as 1688 (according to other sources 1683) in Altona (now a part of Hamburg).

Between 1738 and 1800, many famous intellectuals attended the christianeum as the philosopher Salomon Maimon and the poet Johann Christoph Unzer or the famous Danish painter Jes Bundsen.

In 1816, king Frederik the VI donated the FLORA DANICA, one of the most precious treasures, even nowadays, to the library of the Christianeum, just 16 years later the distinguished historian Theodor Mommsen attended the school.

In 1885, 461 students attended the Christianeum and in the same year the first school trip was made.

When Hitler came into power, many teachers who did not agree with the nationalism ideology got fired.

The Christianeum has a sizable music department, the school choir being the largest in Germany.

On average, enrollment goes well beyond 100 students per year, exceeding most other schools in Hamburg in size.