The Internatsschule Schloss Hansenberg (ISH) is a mixed coeducational secondary boarding school in Geisenheim-Johannisberg in the Rheingau in Hesse, Germany.

It was founded in 2003 by the government of Hesse and is run with the help of two companies (Public Private Partnership): Fraport, and the Merck Group.

The School building and the pupil's residences have been newly built in 2003, but the historical part of old Schloss Hansenberg is still used for the school's library and some club rooms as well as a Snooker Table.

It is an upper-secondary level school; pupils can only apply in the 9th grade.

Accommodation costs 415 Euro per month, while school attendance is free.