Opal (disambiguation)

Opal is a gemstone.

Opal or OPAL may also refer to:

Places

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

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