Johann Christoph Kellner (1706–1772) was a German composer, organist, and music theorist associated primarily with the Baroque and early Classical periods. Born in the town of Mühlhausen, he became known for his contributions to keyboard music and sacred choral compositions. Kellner's musical style reflects the transition from the intricate counterpoint of the late Baroque to the clearer textures of the early Classical era. He served as an organist in various churches, notably in the towns of Mühlhausen and Eisenach, where he developed a reputation for his performances and compositions. Notable works include his keyboard compositions, such as the "Clavier-Übungen" and various chorale preludes, which display his skill in harmonization and counterpoint. His contributions to choral music, particularly in the context of Lutheran liturgical traditions, also stand out. Kellner's impact on music is seen in his influence on subsequent composers, particularly in the realm of keyboard music. His works serve as a bridge between the Baroque and Classical styles, exemplifying the evolution of musical expression in 18th-century Germany. Though not as widely recognized today, his music remains significant for its historical context and stylistic development.