Donald Bain

Donald Bain may refer to:
 * Donald III of Scotland (c. 1033–1099), king of Scotland
 * Donald Bain (writer) (1935–2017), United States author and ghostwriter
 * Donald Bain, first husband of the Scottish Nationalist politician Margaret Ewing
 * Dan Bain (Donald Henderson Bain, 1874–1962), Canadian athlete and merchant