Alexander Macmillan may refer to:
Alexander MacMillan (publisher) (1818–1896), co-founder of Macmillan Publishers Alexander Macmillan, 2nd Earl of Stockton (born 1943), descendant and former chairman of Macmillan Publishers Alexander Hugh Macmillan (1877–1966), member of the Watch Tower Bible & Tract Society Board of Directors in 1918 Alexander Stirling MacMillan (1871–1955), Canadian politician in Nova Scotia Alex McMillan (born 1932), American politician from North Carolina Alexander McMillan (North Carolina politician) (died 1817), American politician from North Carolina Alexander McMillan (Wisconsin pioneer) (1825–1901), American politician in Wisconsin Alexander Macmillan (born 1927), Canadian engineer