| OAK Technology (Zoran Corporation) |
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| OBM (Our Business Machine) – FECHOU |
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| Octek |
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| Ocz |
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| Okidata |
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| Olicom USA |
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| Olitec |
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| Olivetti |
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| Olivetti – Brasil |
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| Olympus |
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| Omega |
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| Omnimedia |
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| OnSpec |
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| OnTrack Data |
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| Opcode |
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| OPL3 (Yamaha) |
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| OPTi – US |
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| OPTi (Silicon Device) – Japan |
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| Optical Access |
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| Opticom |
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| OptiQuest (ViewSonic) |
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| Optorite |
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| Orange Micro |
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| Orchestra |
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| Orchid Technology |
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| Osicom (Meret Optical) |
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| Ositech |
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| Output Technology |
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| OvisLink |
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