John Mackintosh Howie, CBE, FRSE (23 May 1936 – 26 December 2011), was a 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, 1979-81. 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.
- Mathematics Panel, Scottish Examination Board 1967-73; Convener from 1970
- Chairman, Scottish Central Committee for Mathematics 1975-81
- President, Edinburgh Mathematical Society 1973-74
- London Mathematical Society :
- Council 1982-88, 1989–92
- Vice-president 1986-88, 1990–92
- Chairman of Education Committee 1985-89
- Chairman of Public Affairs Committee 1990-92
- Member of Dunning Committee 1975-77
- Chairman of Governors, Dundee College of Education 1983-87
- Governor, Northern College of Education 1987-2001
- Chairman, Scottish Mathematical Council 1987 -93
- Chairman, Committee to review fifth and sixth years (Howie Committee) 1990-92
- Council, Royal Society of Edinburgh 1992-1995
- Chairman, Steering Committee, International Centre for Mathematical Sciences 1991-97.