Gillian Knight (born 1 November 1934) is an English opera singer and actress, known for her performances in the contralto roles of the Savoy operas. After six years from 1959 to 1965 starring in these roles with the D'Oyly Carte Opera Company, Knight began a grand opera career.
Knight joined Sadler's Wells Opera (now known as English National Opera) in 1968 and, in 1970, went on to the Royal Opera, where she performed numerous roles over a period of more than three decades. Knight has performed with many other opera companies in Britain, Europe and America and at houses internationally and has recorded many of her Gilbert and Sullivan and grand opera roles.