Nancy is a fictional character in the 1838 novel Oliver Twist by Charles Dickens and its several adaptations for theatre, television and films. She is a member of Fagin's gang and the lover, and eventual victim, of Bill Sikes.

Oliver Twist; or, The Parish Boy's Progress, is the second novel by English author Charles Dickens. It was originally published as a serial from 1837 to 1839 and as a three-volume book in 1838. The story follows the titular orphan, who, after being raised in a workhouse, escapes to London, where he meets a gang of juvenile pickpockets led by the elderly criminal Fagin, discovers the secrets of his parentage, and reconnects with his remaining family.