Sir Donald MacAlister, 1st Baronet of Tarbet KCB FRSE (17 May 1854 – 15 January 1934) was a Scottish physician who was Principal and Vice-Chancellor and, later, Chancellor of the University of Glasgow. He was a member of the Cambridge Apostles intellectual secret society, from 1876. From 1904 to 1931 he was President of the General Medical Council.