John Mackintosh Howie
- Category : 1936-births
- Type : MGE
- Profile : 3/5 - Martyr / Heretic
- Definition : Single
- Incarnation Cross : RAX The Sleeping Phoenix 2
Scottish mathematician and prominent semigroup theorist. Howie was educated at Robert Gordon's College, Aberdeen, the University of Aberdeen and Balliol College, Oxford.
He won the Keith Prize of the Royal Society of Edinburgh, 1979-1981. He was Regius Professor of Mathematics at the University of St Andrews from 1970-1997. No successor to this chair was named until 2015 when Igor Rivin was appointed.
He died on 26 December 2011, aged 75.