Billy Bang (September 20, 1947 – April 11, 2011), born William Vincent Walker, was an American free jazz violinist and composer.

He later joined Sun Ra‘s band. In 1977, Bang co-founded the String Trio of New York (with guitarist James Emery and double bassist John Lindberg). Bang explored his experience in Vietnam in two albums: Vietnam: The Aftermath (2001) and Vietnam: Reflections (2005), recorded with a band which included several other veterans of that war. The latter album also features two Vietnamese musicians based in the United States (voice and đàn tranh zither).

The film Billy Bang Lucky Man documents his return to Vietnam in 2008 to collaborate with Vietnamese musicians and come to terms with his experiences in the war. A soundtrack album was released in 2021.