- Oak Grigsby
- Ocean Sensors ocean measurement instrumentation and systems
- Ocular graphic LCD module
- Odetics GPS, telecom, space remote sensing, closed circuit video, broadcast management, video traffic detection, automated tape libraries
- Odin TeleSystems subsystems and test equipment for the telecom industry
- Ohio Transformer repair, rebuild, used AC power transformers
- Okaya LCD displays, filters
- Okidata printers
- OKW enclosures
- Olflex specialty flexible wire and cable and accessories
- Olicom ATM switching, edge-devices, routing, network management
- Oltronics network consulting
- Olympus borescopes, fiberscopes, Videoimagescopes, digital high-speed video cameras
- Omega Optical optical filters used for color discrimination in optical and electro-optical systems
- Onkyo consumer audio
- OpAmp Labs hobbyist electronics
- Optical Polymer low refractive cladding material for use with fiber optic cable
- Optima electronic cabinets, desks, and cases
- Opto 22 I/O products, controllers, software, solid state relays, analog/digital I/O hardware and software
- Optotek optoelectronic, semiconductor products and specialized CAE software
- ORA cellular, home office
- Orbital Sciences launch services
- Oregon Micro Systems motion control electronics
- Orion Instruments
- Ormec servo motors and controllers
- Osram Sylvania high intensity lighting
- Overland Data tape archival backup systems
- Oxmoor professional audio
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