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• OAI (GIBSON) | Mandolins
• OAI | Dobro Resonator Guitars
• OAP | Loudspeakers
• Obelisk Drums | Drums | Percussion
• Oberheim (Gibson) | Keyboards | Synthesizers
• Oberheim | Keyboards | Synthesizers
• Obsidian | Software
• Octave Systems | Media | Multimedia Media
• Odysseyprosound) | Used equipment
• OnePower | Pro Audio | Power Conditioners
• Ohm Speakers | loudspeaker
• Oktava | Microphones
• Olson Guitars | Acoustic Guitars
• Omnirax | Studio Furniture
• On-Stage Stands | Stands | Accessories
• OnBoard Research Corporation | (Intellitouch Tuner)
• Onyx Audio | Broadcast | Accessories
• Onyx Media SA | Broadcast | Accessories
• Opcode Systems | Software
• OPNS | Software
• Optek Music Systems |
• Opticom | Software
• Optifile | automation
• Oram | Signal Modification
• Orange Amplification | Guitar Amplification
• Orange County | Drum | Percussion
• Orban | Broadcast | Signal Modification
• Orbit Pickguards | Guitar Accessories
• Orbitone | Software
• Orchid Electronics | Broadcast | Accessories
• Orion Cymbals | Percussion
• Orion Drums | Drums | Percussion Accessories
• Otari | Recorders | Mixing Consoles
• Outboard Electronics | Automation | Controllers
• Outline Professional Audio | Loud Speakers
• Ovation | Guitars
• OWI | Loudspeakers
• Oxmoor | Broadcast