Mount Stewart is a 19th-century house and garden in Northern Ireland.
Mount Stewart may also refer to:
- Mount Stewart, Prince Edward Island, Canada, a municipality
- Mount Stewart (California), United States, a mountain in Sequoia National Park
- Mount Stewart, County Tyrone, a townland in County Tyrone, Northern Ireland
- Mount Stewart (townland), a townland in County Down, Northern Ireland
- Mount Charles Stewart, a mountain in the Canadian Rockies
- Mount Stewart (Alberta), a mountain in Alberta, Canada