Solarium

• A Terrace (building) or flat housetop
• The Solarium Augusti, the largest sundial ever made, erected in Rome by Emperor Augustus
• Sunroom, a room built largely of glass to afford exposure to the sun
• Tanning bed or tanning booth, non-medical devices that emit ultraviolet light for the purpose of creating a cosmetic tanning of the skin
• Solarium (constellation), a former constellation
• Solarium (gastropod), a genus of gastropod

The word solarium (plural solariums or solaria) is Latin and derives from the Latin word sol, meaning "sun".