MacNair is a surname. Notable people with the surname include:
Frances Macdonald MacNair (1873–1921), Scottish artist of the "Glasgow Style" Herbert MacNair, Scottish artist Peter Macnair (born 1940), Canadian anthropologist Rachel MacNair (born 1958), American sociologist and psychologist
Fictional characters with the surname include:
Jamie Macnair, character in The Curse of the Viking Grave Sir Kevin Dean de Courtney MacNair of MacNair, alias of a character in Napoleon Disentimed Walden Macnair, character from the Harry Potter series
See also McNair, surname