Opal (disambiguation)

Opal is a gemstone.

Opal or OPAL may also refer to:

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

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 (software) (Open Physics Abstraction Layer), a real-time physics engine
 * Opal programming language, developed at the Technical University of 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
 * Opal, a Pokémon character in the video games Pokémon Sword and Shield

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
 * 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