Iain Somerled MacDonald MacCormick (28 September 1939 – 19 September 2014) was a Scottish politician. He was a member of the Scottish National Party (SNP). He was MP for Argyllshire from 28 February 1974 until 7 April 1979. He was also a member of the Social Democratic Party (SDP) from 1981 until 1988.
MacCormick was educated in Glasgow. He also worked as a high school teacher in his town.
MacCormick died on 19 September 2014 in Oban, Argyll and Bute, aged 74. The day before he voted in the Scottish independence referendum.