Codename Villanelle is a 2017 thriller novel by British author Luke Jennings. A compilation of four serial e-book novellas published from 2014 to 2016, the novel was published in the United Kingdom by John Murray as an e-book on 29 June 2017, followed by hardcover and paperback versions on 24 August 2017. Codename Villanelle is the basis of the BBC America/BBC Three television series Killing Eve (2018–2022).

Killing Eve is a British spy thriller television series, produced in the United Kingdom by Sid Gentle Films for BBC America and BBC Three. The series follows Eve Polastri, a British intelligence investigator tasked with capturing psychopathic assassin Villanelle. As the chase progresses, the two develop a mutual obsession. Based on the Villanelle novel series by Luke Jennings, each of the show's series is led by a different female head writer. The first series had Phoebe Waller-Bridge as the head writer, the second series Emerald Fennell, the third series Suzanne Heathcote, and the fourth series Laura Neal.