Leslie Harrison Lambert (11 November 1883 – 13 December 1941), known in public as A. J. Alan, was an English magician, intelligence officer, short story writer and radio broadcaster. At the beginning of World War II he worked in naval intelligence at Bletchley Park.

His broadcasting career began when Lambert contacted a member of the then British Broadcasting Company to suggest he might tell one of his own short stories on the radio. This was accepted and so, as A. J. Alan, he broadcast My Adventure in Jermyn Street, on 31 January 1924. Following his immediate success, he quickly became one of the most popular broadcasting personalities of the time.