Alexander van Millingen DD (1840–1915) was a scholar in the field of Byzantine architecture, and a professor of history at Robert College, Istanbul between 1879 and 1915.
He was born in Constantinople the third son of Dr Julius Michael Millingen, court physician to the Sultan, and his wife Zafira Ralli.
He was educated at the Protestant College on the island of Malta and then at Blair Lodge Academy at Polmont in central Scotland.
In July 1879 he married Antoinette Cora Welch, widow of Truman Thomson, of Newhaven, Connecticut.
In September 1895 he married Frances Elizabeth Hope Mackenzie at St Mary's Cathedral in Edinburgh.