Siegfried „Sigi“ Busch is a German jazz bass player, born on 29 October 1943 in Krefeld. He has published several textbooks on bass playing and music theory and used to teach at the Jazz-Institut Berlin as a professor (now retired).

On his releases as a band leader and on his (now defunct) personal website the abbreviation Sigi is used for his first name, but some releases to which he has contributed have occasionally credited him as Siggi Busch.