Johann Peter Kellner (1705–1772) was a German composer, organist, and music teacher, primarily associated with the Baroque and early Classical music eras. He was born in the town of Weimar and is best known for his contributions to keyboard music, particularly for the organ and harpsichord. Kellner's works often exhibit the stylistic traits of the transitional period between the Baroque and Classical styles, blending intricate counterpoint with emerging melodic simplicity. Among his notable works are a collection of keyboard suites and variations that showcase his skill as a composer and performer. His "Clavier-Übung" and various organ compositions reflect both the influence of J.S. Bach and the evolving tastes of the 18th century. Kellner's impact on music primarily lies in his role as an educator and performer, helping to propagate the stylistic elements of the Baroque keyboard repertoire. He also contributed to the development of the keyboard sonata and variations, paving the way for later composers. While not as widely recognized as some of his contemporaries, Kellner's work remains an important part of the historical continuum in the evolution of keyboard music.