Lilian Mary Faithfull CBE (12 March 1865 – 2 May 1952) was an English teacher, headmistress, women's rights advocate, magistrate, social worker, and humanitarian.

Her mother, Edith Lloyd, stayed home with eight children while also writing a History of England and magazine articles.

She lived in an upper-middle class country house in Hertfordshire and was educated at The Grange in Hoddesdon (the only girl at the time), and later at home by her mother and governesses.

[3] Between 1887 and 1888, Faithfull taught at Oxford High School, and was secretary to the principal of Somerville, Madeleine Shaw Lefevre.

[3] In 1890, Faithfull suggested that women who had competed for Oxford or Cambridge in intercollegiate sports should be awarded special badges like their male counterparts.

[5] Along with Margaret Gilliland and Sara Burstall, Faithfull believed that the important household topics of cookery, laundry and hygiene should feature as scientific subjects on the school curriculum.

[6][9] Faithfull was the model for the Helen Butterfield character in The Constant Nymph, a 1924 novel by Margaret Kennedy (a former student of Cheltenham).