John Chalmers may refer to:
John Chalmers (missionary) (1825–1899), Scottish Protestant missionary in China and translator John Chalmers (coach) (1874–1962), American football, basketball and baseball coach John Alan Chalmers (1904–1967), British atmospheric physicist John Chalmers (trade unionist) (1915–1983), Scottish trade unionist John Chalmers (surgeon) (born 1927), Scottish orthopaedic surgeon John Chalmers (medical researcher) (born 1937), Australian medical researcher John Chalmers (moderator), minister of the Church of Scotland One half of the duo (with Sandra Marrs) who creates comic books under the pseudonym Metaphrog