Q is the codename given to the MI6 Quartermaster. Several characters have held the position over the years, such as:
- Major Boothroyd, the armourer who appeared in the novels by Ian Fleming and subsequent continuation novels.
- Ann Reilly, Q's assistant who later fully replaces him in the John Gardner novels. Bond nicknames her Q'ute.
- Boothroyd (Desmond Llewelyn), the most famous Q who appeared in the official Bond films by EON Productions.
- Algernon, played by Alec McCowen, the version of Q which appeared in the 1983 unofficial film Never Say Never Again.
- R, Q's official replacement played by John Cleese.
- Q, the current version of the character played by Ben Whishaw.