| Company | Year | City | Founded By: | Website |
| J.E. Watch Co. | ||||
| Jacob & Co | www.jacobandco.com | |||
| Jaeger | 1925 | Le Sentier | Ed. Jaeger / J.-D. LeCoultre | www.jaeger-lecoultre.com |
| Jaeger-LeCoultre | 1925 | Le Sentier | Ed. Jaeger / J.-D. LeCoultre | www.jaeger-lecoultre.com |
| Jaquet, R. | ||||
| Jardena | ||||
| Jardur | ||||
| Jean d'Eve | 1888 | La Chaux-de-Fonds | C. Barbezat-Baillod | www.jeandeve.ch |
| JeanRichard, Daniel | 1679 | Daniel JeanRichard | www.danieljeanrichard.ch | |
| Jetzer et Fils | www.jetzeretfils.ch | |||
| JoJo | ||||
| Jordi, Michel | 1988 | www.micheljordi.ch | ||
| Journe, Francois-Paul | 1978 | Paris | Francois-Paul Journe | www.fpjourne.com |
| Jovial | 1929 | La Chaux-de-Fonds | Fernand Droz | www.jovialwatch.com |
| Junghans | 1861 | Schramberg | Erhard Junghans/F. Xaver | www.junghans.de |
| Junior | ||||
| Jürgensen, Jules | 1834 | Le Locle | Jules Jürgensen | |
| Jürgensen, Urban & Sonner | 1773 | Copenhagen | Urban Jürgensen | www.juergensen-watch.de |
| Jürgenson, Stovard | ||||
| Juvenia | 1860 | La Chaux-de-Fonds | J. Didisheim-Goldschmidt |
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