John Muir can refer to:
John Muir (1838–1914), Scottish-born American environmentalist
John Muir, South African (1874-1947) medical doctor, naturalist and cultural historian
John Muir (indologist) (1810–1882), Sanskrit expert
John Muir (Liberal politician) (1872–1941), British Liberal Member of Parliament 1923–1924
John William Muir (1879–1931), Scottish socialist journalist and politician, Member of Parliament 1922–1924
John Kenneth Muir (born 1969), author
John Muir (author) (1918–1977), author of How to Keep Your Volkswagen Alive: A Manual of Step-by-Step Procedures for the Compleat Idiot
John Muir (Australian judge)
John Muir College