| OTC | Occupational Training Center 
| Others |
| OTC | Ocean Systems Technician Chief Petty Officer
| Others |
| OTC | Ocean Thematic Centre
| Others |
| OTC | Off The Chart(s)
| Others |
| OTC | Off Topic Comments
| Others |
| OTC | Offender Time Computation
| Others |
| OTC | Office of Technology Commercialization
| Others |
| OTC | Officer in Tactical Command
| Others |
| OTC | Officer Training Corps
| Others |
| OTC | Officers Training Conference
| Others |
| OTC | Offshore Technology Conference
| Others |
| OTC | Offshore Technology Conferences
| Others |
| OTC | Ogeechee Technical College
| Others |
| OTC | Oh Those Clowns
| Others |
| OTC | Ohio Technical College
| Others |
| OTC | Ohio Transportation Consortium
| Others |
| OTC | Okefenokee Technical College
| Others |
| OTC | Oklahoma Tax Commission
| Others |
| OTC | Oklahoma Truck Club
| Others |
| OTC | Oldtimer Center
| Others |
| OTC | Oldtimer Club
| Others |
| OTC | Olney Theatre Center
| Others |
| OTC | Olympic Training Center
| Others |
| OTC | On Target Commission
| Others |
| OTC | On The Car
| Others |
| OTC | On The Clock
| Others |
| OTC | On The Con
| Others |
| OTC | On The Cool
| Others |
| OTC | On the Counter
| Others |
| OTC | On-Going Test Case
| Others |
| OTC | One Team Conference
| Others |
| OTC | One True Church
| Others |
| OTC | One-Time Charge
| Others |
| OTC | Online Teen Club
| Others |
| OTC | Online Training Center
| Others |
| OTC | Online Travel Company
| Others |
| OTC | Ontario Triumph Club
| Others |
| OTC | OnTrack Consulting
| Others |
| OTC | Open Text Corp
| Others |
| OTC | Open Transparent and Connected
| Others |
| OTC | OpenSSL Technical Committee
| Group, Technology, Security |
| OTC | OpenText Corporation
| Others |
| OTC | Operating Telephone Company
| Others |
| OTC | Operation and Transport Corporation
| Others |
| OTC | Operational Test Command
| Others |
| OTC | Operations Technical Center
| Others |
| OTC | Optical Telephone Corporation
| Others |
| OTC | Optimization Technology Center
| Others |
| OTC | Orbiter Test Conductor
| Others |
| OTC | Orbiter Test Conductors
| Others |
| OTC | Order Through Chaos
| Others |
| OTC | Oregon Transportation Commission
| Others |
| OTC | Original Teile Center
| Others |
| OTC | Original Trilogy Collection
| Others |
| OTC | Ornithine Transcarbamylase
| Others |
| OTC | Ornithine Transcarbamylase Deficiency
| Others |
| OTC | Osaka Titanium Technologies
| Others |
| OTC | Other Tennis Club
| Others |
| OTC | Other Than Clinton
| Others |
| OTC | Other Than Collision
| Others |
| OTC | Our Time Cabaret
| Others |
| OTC | Output Transformer Coupled
| Others |
| OTC | Outreach Throughout the Community
| Others |
| OTC | Outside Threaded Container
| Others |
| OTC | Over The Cell
| Others |
| OTC | Over The Counter
| Others |
| OTC | Overflow of Tacho Counter
| Others |
| OTC | Overhead Trip Computer
| Others |
| OTC | Overseas Telecommunications Commission
| Others |
| OTC | Owatonna Tool Company
| Others |
| OTC | Ozarks Technical Community
| Others |
| OTC | Ozarks Technical Community College
| Others |
| OTC | Ozone Transport Commission
| Others |