Jennifer Louise Worth (née Lee; 25 September 1935 – 31 May 2011) was a British memoirist. She is best known for her best-selling trilogy about her work as a nurse and midwife in the poverty-stricken East End of London during the 1950s: Call the Midwife (2002), Shadows of the Workhouse (2005), and Farewell to The East End (2009). A television series, Call the Midwife, based on her books, started broadcasting on BBC One in the UK on 15 January 2012 and on PBS in the US on 30 September 2012.

Worth, born Jennifer Lee while her parents were on holiday in Clacton-on-Sea, Essex, was raised in Amersham, Buckinghamshire. After leaving school at the age of 14, she learned shorthand and typing and became the secretary to the head of Dr Challoner's Grammar School. She then trained as a nurse at the Royal Berkshire Hospital, Reading, and moved to London to receive training to become a midwife.

Lee was hired as a staff nurse at the London Hospital in Whitechapel in the early 1950s. Together with the Sisters of St John the Divine, an Anglican community of nuns, she worked to aid the poor. She was subsequently a ward sister at the Elizabeth Garrett Anderson Hospital in Bloomsbury, and later at the Marie Curie Hospital in Hampstead. She married the artist Phil Worth.