Valjoux (for Vallée de Joux, "Joux Valley") is a Swiss manufacturer of mechanical watch movements. It is known primarily for chronograph ébauche movements that are used in a number of mid to high range mechanical watches: The company has been a part of ETA for a number of years and is a member of the Swatch Group. Valjoux is responsible for the design and manufacture of the Valjoux 7750 movement (and variants), an extremely popular movement used in the majority of mechanical chronograph watches on the market today.

Notable watch brands that use base movements manufactured by Valjoux include Omega, Longines, Breitling, Oris, TAG Heuer, IWC, Porsche Design, and so on.