Jacquie O'Sullivan (born 7 August 1960) is an English singer and songwriter, best known as a member of the pop group Bananarama from 1988 until 1991, replacing Siobhan Fahey, who left in early 1988. The line-up with O'Sullivan had UK top five hits with "I Want You Back" (1988) and a cover of The Beatles' "Help!" (1989), recorded with comedy duo French and Saunders for the charity Comic Relief. In 1989, O'Sullivan joined the group on their first world tour.
