Jean Allister (born Ballymoney, 26 February 1932, died Church Crookham 11 July 2012) was an opera singer who encompassed a wide range of repertoire both on stage and on the concert platform in a career spanning over 30 years.
Allister studied under Norman Allin at the Royal Academy of Music and her early roles included Mistress Quickly at the Academy in 1954, and parts in Elijah at the Royal Festival Hall, and Handel's Belshazzar at the Foundling Hospital in July 1955. She married her fellow student the tenor Edgar Fleet in 1955 and they worked together in several performances including Britten's Spring Symphony at the Royal Academy and Abraham and Isaac at the Royal Court Theatre.
She became a member of the Ambrosian Singers where among fellows altos she sang alongside Pamela Bowden, Heather Harper and Helen Watts. From 1959 to 1970 she sang in fifteen Proms concerts at the Royal Albert Hall, including Henze's Novae de Infinito Laudes with the composer in 1965 and Beethoven's Choral Symphony under Sargent in 1966, and at the Three Choirs Festivals she appeared from 1961 to 1977, where she participated in the British premiere of Martin's In Terra Pax in 1960 and the same composer's Requiem in 1975.