Opal is a gemstone.
Opal or OPAL may also refer to:
Places Canada Opal, Alberta Opal Hills, Jasper National Park, Alberta Opal Cone, a volcano in British Columbia
United States Opal, Missouri, an unincorporated community Opal, South Dakota, an unincorporated community Opal, Virginia, a census-designated place Opal, Wyoming, a town
Science and technology Biology and medicine Opal (apple), a variety of apple produced by crossing Golden Delicious and Topaz varieties Opal (butterfly), common name for the butterfly genus Chrysoritis Omeprazole or Opal, a drug Opal phytolith, a rigid microscopic body that occurs in many plants Opal, a stop codon Open Air Laboratories, an initiative in England to get the public more involved with nature
Computing Opal programming language, developed at Technische Universität Berlin Open Phone Abstraction Library (OPAL), a fork of the H323plus project supporting H.323, SIP, IAX2 Opal Storage Specification, a storage specification developed by the Trusted Computing Group
Physics Open-pool Australian lightwater reactor, a scientific facility in Sydney, Australia OPAL experiment and detector, of the Large Electron-Positron Collider at CERN
Space OPAL (Outer Planet Atmospheres Legacy) Project, observation project of the Hubble Space Telescope
Arts and entertainment The Opal (annual), an annual gift book from 1844 to 1849 Opal (band), a 1980s rock band from Los Angeles, US Jack Stauber's OPAL, a 2020 short film that premiered on Adult Swim
Fictional entities Opal (EastEnders) a character on the BBC soap opera EastEnders Opal (The Simpsons), a talk show host on The Simpsons Opal Otter, the mother of Peanut, Baby Butter and Jelly Otter in PB&J Otter Opal City, a fictional city in the DC Comics universe Opal, a fictional character in the Cartoon Network show Steven Universe Opal, a fictional character in the Nickelodeon show The Legend of Korra
Ships HMS Opal, two ships of the British Royal Navy USS Opal (PYc-8), a United States Navy patrol vessel during World War II
Transportation
Opal (fuel), a brand of petrol produced by BP Australia Opal (armoured personnel carrier), a Polish vehicle Opal card, a smart card used on Sydney's transport network
Other uses Opal (given name) OPAL pipeline, a natural gas pipeline in Germany The Opal, a journal written by the patients of the Utica State Lunatic Asylum c. 1851 Opal (sea otter), a sea otter at the Monterey Bay Aquarium Tropical Storm Opal, several tropical cyclones worldwide have been named Opal Opal Telecom, a former UK business broadband and telephone provider, now known as TalkTalk Business Opal Tower (Leeds), a skyscraper in Leeds, England Opal Tower (Sydney), a skyscraper in Sydney, Australia Australia women's national basketball team or the Opals Opal, a product by Nói Síríus
See also Upal, a town in Xinjiang, China Opals (disambiguation) Opel (disambiguation)