Atrium
Atrium may refer to:
Anatomy
- Atrium (heart), an anatomical structure of the heart
 - Atrium, the genital structure next to the genital aperture in the reproductive system of gastropods
 - Atrium of the ventricular system of the brain
 - Pulmonary alveolus (also known as atrium alveolus), microscopic air sac in the lungs
 
Architecture
- Atrium (architecture), an open space within a building, either open to the sky or featuring a glass roof
- Ancient Roman atrium, a grand entrance hall, reception room, and living room in a traditional Roman house.
 
 
Specific buildings
- Amot Atrium Tower, a tower in Ramat Gan, Israel
 - Atrium, Cardiff, a University of South Wales building in Cardiff
 - Atrium Building, a skyscraper in Guatemala City
 - Atrium Casino, a casino in Dax, France
 - Atrium Cinemas, a movie theatre in Karachi, Pakistan
 - Winter Garden Atrium, a Brookfield Properties building in the World Financial Center of the World Trade Center, New York City
 - Atrium on Bay, a retail and office complex in Toronto, Canada
 
Companies
- Atrium Health, based in Charlotte, North Carolina