Hasaan Ibn Ali (born William Henry Langford, Jr.; May 6, 1931 – 1980) was an American jazz pianist and composer.
Ibn Ali was strongly influenced by Elmo Hope, and his playing was rapid and intense, retaining a sense of rhythm even when his style became increasingly unconventional.
Several recordings of his playing may exist, but only one – The Max Roach Trio Featuring the Legendary Hasaan – has been released.
Ibn Ali built a reputation in Philadelphia, where he influenced musicians including John Coltrane, but he remained little known elsewhere.