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 Scouting 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
Topics referred to by the same term
This disambiguation page lists articles associated with the title OA.If an internal link led you here, you may wish to change the link to point directly to the intended article. Categories: