text: Harry Locke (1913–1987) (3) was a well-used supporting artist within the British film industry.  His 3 Carry On appearances are all in medical comedies: Nurse, Doctor, and Again Doctor.
  Reuben Martin (born 1921) (2) played gorillas in both Up The Jungle and Emmannuelle (the latter unaccredited).  He also donned his gorilla suit for an episode of the TV Carry On Laughing series.
  Derek Martinus (1931–2014) (1) appeared in just one of the series, Sergeant.  He went on to become a TV director of note, directing (amongst other things) 9 episodes of William Hartnell era Doctor Who, 17 further episodes of Doctor Who, and 2 episodes of Blake's 7.
  Larry Martyn (1934–1994) (2) had small roles in Convenience and Behind.
  Rik Mayall (1958–2014) (1) Columbus.
  William Mervyn (1912–1976) (3) has cameo roles in Follow That Camel, Again Doctor, and Henry.
  Olive Milbourne (1909-1994) (1) later found fame as Terry's mum in The Likely Lads (on both TV and radio), and its sequel Whatever Happened To The Likely Lads, but an early unaccredited appearance was as a sexy GlamCab driver in Cabby.
  Larry Miller (born 1953) (1) Columbus.
  Warren Mitchell (1926–2015) (1) made an entertaining, single appearance in Cleo.  He went on to create the role of Alf Garnett for writer Johnny Speight.
  Trisha Noble (1944–2021) (1) had a large supporting role in Camping, but her role was decreased during editing.