Mair is a surname in the Scots and German languages, deriving from Latin maior ('greater'). Notable people with the surname include:
- People with the surname Mair in Scots context
- Adam Mair (born 1979), Canadian ice hockey player
- Alexander Mair (1889–1969), Premier of New South Wales (1939–1941)
- Charles Mair, Canadian poet, son of Scottish immigrants
- Ernest Mair, Australian rugby league football coach
- Eddie Mair, Scottish television and radio presenter
- Gilbert Mair (trader) (1799–1857), sailor and trader in New Zealand
- William Gilbert Mair (1832–1912), soldier, son of above
- Gilbert Mair (soldier) (1843–1923), soldier, son of above
- Ken Mair, activist, descendant of above
- Lee Mair (born 1980), Scottish footballer
- Norman Mair, Scottish rugby player and analyst
- Rafe Mair, Canadian political commentator
- Robert Mair, Master of Jesus College, Cambridge
- Sarah Mair (1846–1941), Scottish campaigner for women's suffrage and education
- William Mair (South Australian politician) (died 1897), member of the South Australian House of Assembly
- Bill Mair (1900–1964), Australian politician, member of the Victorian Legislative Council
- William Mair (chemist) (1868–1948), Scottish pharmacist and manufacturing chemist
- William Mair (moderator) (1830–1920), Scottish minister
- William Crosbie Mair (died 1831), Scottish physician
- People with the surname Mair in German context
- Mair von Landshut, late 15th-century German engraver.
- Amanda Mair, Swedish singer and musician
- Franz Mair (1821–1893), Austrian composer and choral conductor
- Klaus Mair (born 1977), Austrian politician
- Paulus Hector Mair (1517–1579), Augsburg civil servant
- Michael Mair (born 1962), Italian skier
- Natascha Mair, Austrian ballet dancer
- Victor H. Mair, American Professor of Chinese Language and Literature
- Wolfgang Mair (born 1980), Austrian footballer