Alan Warren Haig (July 19, 1922 – November 16, 1982) was an American jazz pianist, best known as one of the pioneers of bebop.

Haig was born in Newark, New Jersey and raised in nearby Nutley. In 1940, he majored in piano at Oberlin College. He started performing with Dizzy Gillespie and Charlie Parker in 1945, and performed and recorded under Gillespie from 1945 to 1946, as a member of Eddie Davis and His Beboppers in 1946 (also featuring Fats Navarro), and the Eddie Davis Quintet in 1947, under Parker from 1948 to 1950, and under Stan Getz from 1949 to 1951. The Gillespie quintet, which included Haig, recorded four 78 r.p.m. sides for Guild Records in May 1945 which are regarded as the first recordings to demonstrate all elements of the mature bebop style. He was part of the nonet on the first session of Miles Davis‘ Birth of the Cool.