OTC

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

• Over-the-counter drug
• Oxytetracycline

• Ornithine transcarbamylase, also called OTC gene or ornithine carbamoyltransferase

• 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

• Offworld Trading Company, a real-time strategy video game
• The Olivia Tremor Control, a band
• Opera Theatre Company, merged with {{nobr|Wide Open Opera}} in 2017 to form Irish National Opera
• OTC (band), a Congolese soukous group
• Roman Reigns, a professional wrestler whose nickname is "The OTC"

• 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

• 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

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

• Officer in tactical command
• Officers' Training Corps

• 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

• 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

• Oct (disambiguation)

{{disambiguation}}