A Matter of WHO is a 1961 British comedy thriller film directed by Don Chaffey and starring Terry-Thomas as a World Health Organization employee trying to trail the source of a deadly virus. It also featured Julie Alexander, Sonja Ziemann, Alex Nicol, Richard Briers, Honor Blackman and Carol White. It was made at MGM-British Elstree Studios with sets designed by Elliot Scott. MGM records say it lost $142,000.