Iain Stewart

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) (born 1969), Scottish football player and manager
 * Iain Stewart (geologist) (born 1964), Scottish geologist
 * Iain Stewart (physicist), Canadian-American theoretical nuclear and particle physicist
 * Iain Stewart (politician) (born 1972), British Conservative Member of Parliament for Milton Keynes South
 * Iain Maxwell Stewart (1916–1985), Scottish industrialist