The Choriner Musiksommer (literally, Chorin's Summer of Music) is an outdoor music festival held in the ruins of the cloister of Chorin Abbey in Chorin, Brandenburg, Germany.
It originated as a single annual concert, established on 23 May 1964 by Albert Richter as an event for employees of the Hochschule für nachhaltige Entwicklung (Institute of Forest Sciences) in Eberswalde - the monastery ruins were then managed by the forest administration and so they became the venue for the concert. The number of concerts was raised to four in 1970 and from then until 1973 numbers rose from 600 to 1200 and finally 2,100 per concert. In 1974 the number of concerts was raised to thirteen and after the fall of the Berlin Wall in 1989 the festival's organization was transferred to an independent organization. It now consists of around fifteen concerts of 17th to 19th century music, rarely-heard pieces and choral music.