Solarium may refer to: A sunroom, a room built largely of glass to afford exposure to the sun A terrace (building) or flat housetop The Solarium Augusti, a monumental meridian line (or perhaps a sundial) erected in Rome by Emperor Augustus A 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 (myrmecology), an earthen structure constructed by certain ants for the purpose of brood incubation Solarium, a PHP client for interacting with Apache Solr Project Solarium, an Eisenhower administration initiative to analyze policy towards the Soviet Union Cyberspace Solarium Commission, which works to establish policy solutions to prevent and prepare against cyber attacks. See also Solaria (disambiguation)