Alexander McArthur (1814–1909) was an Irish-born Australian and British businessman and politician.
Alexander McArthur may also refer to:
Alex McArthur (born 1957) an American actor Alexander McArthur, unemployed worker and co-author of 1935 novel No Mean City
See also McArthur (surname) Laurie McArthur (Lawrence Alexander McArthur, 1930–1996), Australian politician, son of Alexander McArthur