Erzbischöfliches St.-Ursula-Gymnasium Schloss Hohenburg Lenggries, Catholic girls' gymnasium in Lenggries, Germany.

The Erzbischöfliches St.-Ursula-Gymnasium occupies Schloss Hohenburg, a building erected in 1718 on a low rise above the Isartal at the edge of Lenggries. The same site also houses the Erzbischöfliche St.-Ursula-Realschule. The school is run by the Erzdiözese München und Freising and teaches in two streams, a linguistic and a social-science branch, with a Tagesheim for all-day care.

The Ursulines opened a girls' Realgymnasium in Landshut in 1951 and moved it to Hohenburg in 1958, after establishing a branch there in 1953. Teaching began with 31 pupils; numbers rose to 166 by 1967 and 224 by 1977, most living in the boarding school. In 1990 the order handed the school to the Archdiocese of Munich and Freising, and the boarding school closed in 2001.

The school maintains a Catholic identity visible in how students use the chapel and how the community gathers in the historic spaces converted to educational purposes. The religious foundation shapes daily routines and the way the school approaches learning and student life within the castle walls.

The school occupies Schloss Hohenburg on a low rise at the edge of Lenggries above the Isar valley; the grounds are a working school site, so visits are only possible by arrangement with the administration. The building is reached on foot from the village, and the slope up to it is short but steady.

The gymnasium has long been an all-girls school and will begin accepting male students for the first time starting in the 2024-25 academic year in fifth grade. This change marks a notable shift in the school's identity after decades of serving only female students.