next| Company | Year | City | Founded By: | Website |
| Ace Acro | ||||
| Actua | ||||
| Admes | ||||
| Aegler | 1878 | Biel | Jean Aegler | |
| Aero Watch | 1910 | Neuchatel | www.aerowatch.ch | |
| Agassiz Watch Co. | 1876 | Geneve | Fabr. d'horlogerie du Vallon | |
| Alavente | ||||
| Alfex | 1948 | Lugano | www.alfex.ch | |
| Allaine | ||||
| Alpha | ||||
| Alpina, Union Horlogere | 1883 | Biel | (Genossenschaft) Co-Op | www.alpina-watches.com |
| Alsta | ||||
| Alton | ||||
| Altus | 1920 | Biel | Hans Troesch | |
| Americus | ||||
| Amida | ||||
| Ancre | ||||
| Andersen, Svend | 1979 | Geneve | Svend Andersen | www.andersen-geneve.ch |
| Angelus | 1891 | Le Locle | Stolz Freres S.A. | |
| Angular Momentum | 1999 | Bern | www.angularmomentum.com | |
| Ankra | ||||
| Anonimo | ||||
| Antima | 1919 | |||
| Aqua Master | ||||
| Aquanautic | Geneve | www.aquanautic.com | ||
| Aramis | ||||
| Arbi | ||||
| Arbu | 1937 | Biel | A. Bueche | |
| Arctos | ||||
| Arctus | ||||
| Ardath Watch Co. | 1935 | Geneve | Edmond Dreyfus | |
| Aristo | 1907 | Pforzheim | Julius Epple | www.aristo-watch.de |
| Arnex Leica | ||||
| Arsa | 1898 | Tramelan | A. Reymond | www.a-reymond.com |
| Asprey | ||||
| Atlantic | 1888 | Bettlach | E. Kummer | www.atlantic-watch.ch |
| Aubert-Piguet, A. | 1895 | Le Brassus | Paul Piguet-Capt | |
| Audax | ||||
| Audemars Piguet | 1875 | Le Brassus | J. Audemars & E. Piguet | www.audemarspiguet.com |
| Autdrist | ||||
| Avalon | ||||
| Aviatex |
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