Bach Collegium Japan (BCJ) is composed of an orchestra and a chorus specialising in Baroque music, playing with period instruments. It was founded in 1990 by Masaaki Suzuki with the purpose of introducing Japanese audiences to European Baroque music. Suzuki still remains its music director. The ensemble holds an annual series of concerts of Johann Sebastian Bach's cantatas and instrumental programs.

BCJ has recently extended its activities to the international music scene with appearances at major festivals in cities such as Santiago de Compostela, Tel Aviv, Leipzig and Melbourne in 2000, the 250th anniversary year of Bach’s death. In recent years BCJ had given concerts in the United Kingdom, Italy, Spain, the United States, South Korea and Germany, including Bach's cantatas.