Iain Stewart may refer to:Iain Stewart, drummer and member of Scottish indie rock band The Phantom Band Iain Stewart, former president of the Public Health Agency of Canada from 2020 to 2021 Iain Stewart (footballer), Scottish football player and manager Iain Stewart (geologist), Scottish geologist Iain Stewart (physicist), Canadian-American theoretical nuclear and particle physicist Iain Stewart (politician), British Conservative Member of Parliament for Milton Keynes South Iain Maxwell Stewart (1916–1985), Scottish industrialist