Lionel Davidson FRSL (31 March 1922 – 21 October 2009) was an English novelist who wrote spy thrillers.
Lionel Davidson was born in 1922 in Hull, Yorkshire, one of nine children of an immigrant Jewish tailor. He left school early and worked in the London offices of The Spectator magazine as an office boy. Later, he joined the Keystone Press Agency. During World War II, he served with the Submarine Service of the Royal Navy.
When the war ended, he returned to the Keystone Agency and travelled all over Europe as a freelance reporter. It was during one of these trips that he came up with the idea for his first thriller, The Night of Wenceslas (1960). The novel is set in Czechoslovakia during the Cold War, and tells the story of young Nicolas Whistler, a 24-year-old Londoner whose business trip to Prague goes horribly awry. Its taut prose and skilful plotting made The Night of Wenceslas an instant success, and immediately pushed Davidson into the front ranks of the genre, inviting favourable comparisons with such luminaries as Eric Ambler. Davidson became one of the handful of living writers to have their first novel appear in a green Penguin jacket. The book won the Crime Writers' Association's Gold Dagger Award (the top prize for crime and spy fiction in Britain) as well as the Authors' Club First Novel Award. It was filmed as Hot Enough for June (1964), with Dirk Bogarde in the role of Whistler.