Look up oa in Wiktionary, the free dictionary.
OA, O.A., Oa, or oa may refer to:
Arts and entertainment
- Oa (comics), a fictional planet in the DC Comics universe
 - The OA, a television series
 - OpenArena, a video game
 - Opie and Anthony (often "O&A"), a radio show
 - Oriental Adventures, a Dungeons & Dragons sourcebook
 - Orion's Arm, a science fiction project
 
Businesses and organisations
- Obavještajna agencija, the Croatian Intelligence Agency
 - Office administration
 - Oficina Anticorrupción, an Argentine law enforcement agency
 - Olympic Air (IATA code OA)
 - Opera Australia, an opera company
 - Opportunitas aequa, a Canadian organization
 - Overeaters Anonymous
 - Oxford Academy (California), a high school
 - Orbital ATK, an aerospace company
 
People
- Ma'am OA, nickname of Andrea Veneracion, founder of the Philippine Madrigal Singers
 - Oskar Andersson, Swedish cartoonist who uses the pen name O.A.
 
Places
- Oa (Attica), a deme of ancient Attica
 - Ocean Acres, New Jersey, United States
 - Orakzai Agency, Pakistan
 - The Oa, Scotland, United Kingdom
 
Honors
- Order of Australia, a formal honour
 - Order of the Arrow, the honor society of the Boy Scouts of America
 
Science and technology
- Office automation
 - Oleic acid, a fatty acid
 - Open access, the free online availability of digital content from scholarly sources
 - Operational amplifier, an electronic component
 - Operational analysis, more generally called "operational research", a branch of applied mathematics
 - Osteoarthritis, a disease
 - Length overall (also o/a, o.a. or oa), an abbreviation for overall, used when describing the length of a ship
 - Oxford Archaeology
 
Other uses
- Oa (digraph)
 - Obituaries Australia, an online database of obituaries
 - Office Action, a communication from the U.S. Patent and Trademark Office
 - Old Alleynian, an old boy of Dulwich College
 - Old Albanian, an old boy of St Alban School, St Albans
 - Order of Appearance, a synonym for Order of battle
 - Output area, an area of approximately 100 households, derived from the UK Census
 
See also
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