next| Company | Year | City | Founded By: | Website |
| Octo | ||||
| Ofair | ||||
| Officine Panerai | 1860 | Florence | Guido Panerai & Figlio | www.panerai.com |
| Ogival | ||||
| Ollech & Wajs | ||||
| Ollendorff | ||||
| Olma, Numa Jeannin | 1906 | Fleurier | Numa Jeannin | |
| Olymp | ||||
| Olympia | ||||
| Olympic | ||||
| Omega | 1848/1894 | Biel | Louis Brandt | www.omega.ch |
| Omnia | ||||
| Op De Beeck, Jozef | ||||
| Opel | ||||
| Optima | ||||
| Orator | ||||
| Orfeo | ||||
| Orfina | ||||
| Oris | 1904 | Holstein | Cattin & Christian | www.oris.ch |
| Orvin | ||||
| Ostara | ||||
| Otium | 1999 | Munchen | Dirk Hillgruber | www.otium-uhren.de |
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