Grenchen is a watch city in Switzerland in the Canton of Solothurn at the German-French language border. It is called Granges in French, but this is also the name of two other municipalities in other parts of the country.

Known as Grenchen-based watch manufacturers are Breitling, Fortis, Titoni, Eterna and Porsche Design and the movement manufacturers Adolph Schild S.A. and ETA.

• Altus
• Apella
• Delbana
• Eska/Kocher
• Eterna
• Felca
• Fortis
• Hofer
• Kurth Frères
• Nivada
• Optima
• Orfina
• Ris
• Rodania
• Sorna
• Tschuy Frères