Iain Stewart

• 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 , Scottish football player and manager
• Iain Stewart , Scottish geologist
• Iain Stewart, Canadian-American theoretical nuclear and particle physicist
• Iain Stewart , British Conservative Member of Parliament for Milton Keynes South
• Iain Maxwell Stewart, Scottish industrialist