Sislin Fay Allen (born in c. 1939) was the first non-white woman police constable in the United Kingdom, serving in the Metropolitan Police in London from 1968 to 1972. Allen was born in Jamaica. She qualified as a state registered nurse and worked at the Queen's Hospital, Croydon, a geriatric hospital in South London. She was married to a fellow Jamaican immigrant and had two children, although one was probably born after her service. She had always been interested in the police and in 1968 saw a recruitment advertisement in the newspaper, applied, and was selected. The first black male officer, Norwell Roberts, had only joined the Metropolitan Police the previous year.