| Q3 Innovations | | Offers professional and personal alcohol detectors and accessories. |
| Q5 USA | | Sells surveillance and security products such as cameras, DVRs, monitors, access control and wireless equipment. |
| Quantronics Australia | | Retail and wholesale satellite TV, console modification chips and accessories such as cables and mobile phone gear. Sales, service and repair. Quantronics is based in Sydney. |
| QuantumGear | | Provides a line of lasermeters, PDA's, GPS devices and accessories. |
| Quicksell Express | | Offers a variety MP3s, portable DVDs, GPS navigation systems and kids electronics toys. |
| Quiggleys Emporium | | Offers portable and home audio and video products, phones, games, accessories and collectibles. |
| Quware | | Offers home electronics, office supplies, computer accessories and gifts. |
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