John Muir (1838–1914) was a Scottish-born American environmentalist and author.
John Muir may also refer to:
John Muir (engineer) (1918–1977), American engineer and author
John Muir (footballer, born 1903), Scottish footballer (Dumbarton FC)
John Muir (footballer, born 1947), Scottish footballer (St Johnstone FC)
John Muir (indologist) (1810–1882), British linguist
John Muir (judge) (fl. c. 2000), judge within the Supreme Court of Queensland, Australia
John Muir (South African naturalist) (1874–1947), Scottish-born South African physician, naturalist and historian
John Kenneth Muir (born 1969), American author
John Ramsay Muir (1872–1941), British Liberal Member of Parliament (1923–1924)
John William Muir (1879–1931), British journalist and Member of Parliament (1922–1924)
John Muir College, an undergraduate college of the University of California, San Diego
John Muir Wilderness, California
John Muir National Historic Site, in the San Francisco Bay area, California
John Muir Trail, California
John Muir Parkway, part of California State Route 4
John Muir Trail (Tennessee)
John Muir Trust, a Scottish charity
John Muir Country Park, East Lothian, Scotland
John Muir Way, a coastal path in East Lothian
John Muir Award (disambiguation), various environmental awards
Muir Middle School (disambiguation), mostly schools named John Muir
John Muir Health, a health care service
John Muir Branch Library, Los Angeles
