The Ruby in the Smoke (1985) is a novel by the English author Philip Pullman. It was also adapted for television in 2006. It is the first of the Sally Lockhart Quartet. It is followed by The Shadow in the North, The Tiger in the Well and The Tin Princess.
A TV Film adaptation written by Adrian Hodges and starring Billie Piper was produced by the BBC. It aired on BBC One on 27 December 2006 and on PBS's Masterpiece Mystery! as The Sally Lockhart Mysteries: The Ruby in the Smoke on 4 February 2007. The UK broadcast attracted 7.07 million viewers. It is notable as marking the TV debut of actor Matt Smith, who would later take over the role of The Doctor in Piper's former series, Doctor Who.
All four Sally Lockhart books were expected to be adapted for television; however, as of March 2014 no information has arisen regarding an adaptation of The Tiger in the Well.