Fanny by Gaslight is a 1940 novel by the English author Michael Sadleir. Sadleir's best-known work, it is a fictional exploration of prostitution in Victorian London. It has been adapted several times, most notably in a 1944 Gainsborough Pictures film of the same name starring Phyllis Calvert, and a 1981 four-part BBC television series with Chloe Salaman in the title role.