Detective Sergeant/Detective Inspector Robert "Robbie" Lewis is a fictional character in the Inspector Morse crime novels by Colin Dexter. The "sidekick" to Morse, Lewis is a detective sergeant in the Thames Valley Police, and appears in all 13 Morse novels. In the television adaptation, Inspector Morse, he is played by Kevin Whately. Following the conclusion of the series, Whately reprised the role as the lead character in Lewis, in which the character has been promoted to the rank of inspector.

Norman Colin Dexter was an English crime writer known for his Inspector Morse series of novels, which were written between 1975 and 1999 and adapted as an ITV television series, Inspector Morse, from 1987 to 2000. His characters have spawned a sequel series, Lewis, from 2006 to 2015, and a prequel series, Endeavour, from 2012 to 2023.