| Company | Year | City | Founded By: | Website |
| Mahara MHR | www.mhr.ch | |||
| Majuvy | ||||
| Mappin | ||||
| Mar Nicolet | ||||
| Marcel, Jean | www.jeanmarcel.com | |||
| Marcello C. | 1993 | Marcell Kainz | www.marcelloc.de | |
| Marchal, Rene | ||||
| Marlys | ||||
| Marquand, Andre Le | 1978 | Andre Le Marquand | www.lemarquand.ch | |
| Mars | ||||
| Martel Watch | 1911 | Les Ponts-de-Martel | Georges Pellaton-Steudler | |
| Marvin Watch | 1850 | La Chaux-de-Fonds | Marc and Emmanuel Didisheim | |
| Mathey-Tissot | 1886 | Les Ponts-de-Martel | Edm. Mathey-Tissot | |
| Mauboussin | 1827 | Rocher | www.mauboussin.com | |
| MeisterSinger | 2002 | M. Brassler | www.meistersinger.net | |
| Mellerio dits Meller | 1613 | www.mellerio.fr | ||
| Mey & Waller | www.mey-waller.de | |||
| Meylan Watch Co. | 1878 | Le Brassus | Ch.-H. Meylan | |
| Mido | 1918 | Biel | G. Scharen | www.mido.ch |
| Mille, Richard | www.westimewatches.com | |||
| Milus | 1920 | www.milus.com | ||
| Mimo | 1889 | La Chaux-de-Fonds | Otto Graef | |
| Minerva | 1858 | Villeret | Robert Freres | www.minervawatches.com |
| Mink, Daniel | ||||
| Moeris | 1893 | St. Imier | Moeri & Jeanneret | |
| MOMO Design | 1969 | Giampero Moretti | www.momotime.com | |
| Monarch | ||||
| Mondaine | 1951 | Zurich | www.mondaine.com | |
| Monnat, Jac./Wakmann | ||||
| Mont d' Or | Bienne | www.montdor.com | ||
| Montblanc | www.montblanc.com | |||
| Montbrilliant | ||||
| Monte | ||||
| Montega | www.montega.com | |||
| Moriva | ||||
| Moser, Henry | 1826 | Le Locle | Henry Moser | |
| Movado Watch Co. | 1881/1906 | La Chaux-de-Fonds | L.A. Ditesheim | www.movado.com |
| Mt. Vernon | ||||
| Mühle Glashütte | 1896 | Glashütte | Robert Mühle | www.muehle-uhren.com |
| Mulco, Lorton | ||||
| Muller, Franck | Geneve | Franck Muller | www.franckmullerusa.com |
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