Muir may refer to:

People:

• Thomas Muir (1765–1799), Scottish radical.
• John Muir (1810–1882), British Sanskritist.
• William Muir (1819–1905), British orientalist.
• John Muir (1838–1914), British environmentalist, explorer, and writer.
• Richard Muir (1857–1924), British prosecutor.
• Thomas Muir (1844–1934), British mathematician.
• Kenneth Muir (1912–1950), British soldier, recipient of the Victoria Cross.
• Edwin Muir (1887–1959), British poet, novelist and translator.
• Malcolm Muir (1885–1979), U.S. magazine industrialist.
• Jean Elizabeth Muir (1928–1995), British fashion designer.
• Frank Muir (1920–1998), British comedian.
• Francis Muir (born 1926), British geophysicist.
• Lois Muir (born 1935), New Zealand sportswoman.
• Leilani Muir (born 1944), Canadian plaintiff.
• Norrie Muir (born 1948), British mountaineer.
• Jim Muir (born 1958), U.S. skateboarder.
• Mike Muir (born 1964), U.S. singer.
• John Kenneth Muir (born 1969), U.S. writer on film and television.
• Bryan Muir (born 1973), Canadian ice hockey player.
• Sean Muir (born 1983), U.S. playwright.
• Jamie Muir, British percussionist.

Places:

• Lake Muir, Western Australia.
• Muir Glacier, Alaska, USA.
• Mount Muir, California, USA.
• Muir Beach, California, USA.
• Muir Woods National Monument, California, USA.
• Muir, Michigan, USA.

Other:

• Muir Island, fictional island in the Marvel Comics universe.