Ivor MacGillivray (24 May 1840 – 16 January 1939) was an Australian politician who represented the South Australian House of Assembly multi-member seat of Port Adelaide from 1893 to 1918. He was a member of the United Labor Party until the 1917 Labor split, when he joined the splinter National Party. He retired following the loss of his parliamentary seat in 1918. MacGillivray died at the Adelaide Hospital in 1939, aged 98, following a fall in his home. He was buried at Cheltenham Cemetery.