Thirty-two new piano transcriptions of selected Bach organ chorales comprise this dissertation. Examples of the various types of the organ chorale are included. Seven pieces from the recently-discovered Neumeister Collection have also been transcribed . Each transcription is accompanied by a commentary which includes the text and translation of the German Reformation hymn upon which the piece is based, a discussion of the music itself and its relationship to the hymn text, and a description of the specific method used in transcribing the piece for piano. The transcriptions themselves cover a range of technical difficulties, from pieces intended for the student to compositions for public performance. Furthermore, some are arranged for piano duet, duo, and in one case, for two pianos, eight hands. The method of transcription varies from an attempt to approximate the organ sound to an approach in which creating a new, thoroughly pianistic timbre is the goal. In some cases significant portions of Bach's originals have been arranged in order to accommodate the piano and its sound.