Look up opal in Wiktionary, the free dictionary.

Opal is a gemstone.

Opal or OPAL may also refer to:

• Opal, Alberta
• Opal Hills, Jasper National Park, Alberta
• Opal Cone, a volcano in British Columbia

• Opal, Missouri, an unincorporated community
• Opal, South Dakota, an unincorporated community
• Opal, Virginia, a census-designated place
• Opal, Wyoming, a town

• 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

• OPAL (software) (Open Physics Abstraction Layer), a real-time physics engine
• 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

• Open-pool Australian lightwater reactor, a scientific facility in Sydney, Australia
• OPAL experiment and detector, of the Large Electron-Positron Collider at CERN

• OPAL (Outer Planet Atmospheres Legacy) Project, observation project of the Hubble Space Telescope

• 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

• 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

• HMS Opal, two ships of the British Royal Navy
• USS Opal (PYc-8), a United States Navy patrol vessel during World War II

• 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

• 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

• Upal, a town in Xinjiang, China
• Opals (disambiguation)

This disambiguation page lists articles associated with the title Opal.
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