"Fallen woman" is an archaic term which was used to describe a woman who has "lost her innocence", and fallen from the grace of God. In 19th-century Britain especially, the meaning came to be closely associated with the loss or surrender of a woman's chastity and with female promiscuity. Its use was an expression of the belief that to be socially and morally acceptable, a woman's sexuality and experience should be entirely restricted to marriage, and that she should also be under the supervision and care of an authoritative man. Used when society offered few employment opportunities for women in times of crisis or hardship, the term was often more specifically associated with prostitution, which was regarded as both cause and effect of a woman being "fallen". The term is considered to be anachronistic in the 21st century, although it has considerable importance in social history and appears in many literary works.

Josephine Elizabeth Butler was an English feminist and social reformer in the Victorian era. She campaigned for women's suffrage, the right of women to better education, the end of coverture in British law, the abolition of child prostitution, and an end to human trafficking of young women and children into European prostitution.