OTC
OTC may refer to:

Finance
Over-the-counter (finance)
One time charge, for example in the big bath technique
Order to cash process

Medicine
Over-the-counter drug
Oxytetracycline

Biochemistry
Ornithine transcarbamylase, also called OTC gene or ornithine carbamoyltransferase

Computer science and technology
On-tape Catalog, a section of a Microsoft Tape Format file
OpenType Collection (OTC), a file format for bundling multiple OpenType fonts
Orbiter test conductor, part of NASA's Launch Control Center

Arts, entertainment, and media
Offworld Trading Company, a real-time strategy video game
The Olivia Tremor Control, a band
Opera Theatre Company, merged with Wide Open Opera in 2017 to form Irish National Opera
OTC (band), a Congolese soukous group

Brands and enterprises
Oliver Typewriter Company, a former US company
Open Text Corporation, a Canadian software company
Oriental Trading Company, based in Omaha, Nebraska
Oshkosh Truck Corporation, former name of the Oshkosh Corporation
OTC Markets Group, a private company that provides services to the US over-the-counter securities market
OTC Tool Company, originally the Owatonna Tool Company

Organizations
Education
Oakwood Technology College, in Rotherham, South Yorkshire
Okefenokee Technical College, in Waycross and Alma, in the US state of Georgia
Ozarks Technical Community College, in Springfield, Missouri
Roy Campanella Occupational Training Center, public high school in Brooklyn, New York

Government
Office of Transportation Cooperatives
Ohio Turnpike Commission
Oklahoma Tax Commission
Overseas Telecommunications Commission, Australia's former international telecommunications service

Military
Officer in tactical command
Officers' Training Corps

Other organizations
Offshore Technology Conference, an organization that holds conferences on offshore energy technology, based in Houston, Texas
One Thousand Children, child survivors of the Holocaust who fled to America without their parents
Oregon Track Club, an athletic association

Places
Bol-Bérim Airport, by IATA-Code
Odenton Town Center
Ogilvie Transportation Center, Chicago, Illinois
Overlake Transit Center
United States Olympic Training Center, training facility for US Olympic and Paralympic athletes

See also
Oct (disambiguation)