Johann Balthasar Freisslich (c. 1730–after 1790) was a German composer and organist, primarily associated with the late Baroque and early Classical periods. His work is characterized by the integration of traditional Baroque forms with emerging Classical styles. Freisslich is best known for his contributions to organ music, particularly his collections of organ sonatas and preludes, which exhibit virtuosic techniques and rich harmonic language. Notable works include his "12 Sonate für Orgel" and various liturgical compositions that showcase his skill as both a composer and performer. His music often reflects the stylistic transition of the time, bridging the ornate qualities of Baroque music with the clearer structures of the Classical era. Freisslich's impact on music, while not as widely recognized as contemporaries like J.S. Bach or C.P.E. Bach, lies in his role in the development of organ music and the evolution of compositional style during a pivotal period in Western music history. His works contributed to the repertoire of organists and influenced the subsequent generation of composers in the transition towards the Classical style.