A watchmaker is an artisan who makes and repairs watches. Since a majority of watches are now factory-made, most modern watchmakers only repair watches. However, originally they were master craftsmen who built watches, including all their parts, by hand. Modern watchmakers, when required to repair older watches, for which replacement parts may not be available, must have fabrication skills, and can typically manufacture replacements for many of the parts found in a watch. The term clockmaker refers to an equivalent occupation specializing in clocks.

Most practising professional watchmakers service current or recent production watches. They seldom fabricate replacement parts. Instead they obtain and fit factory spare parts applicable to the watch brand being serviced. The majority of modern watchmakers, particularly in Switzerland and other countries in Europe, work directly for the watchmaking industry and may have completed a formal watchmaking degree at a technical school. They also receive in-house "brand" training at the factory or service center where they are employed. However, some factory service centers have an approach that allows them to use 'non-watchmakers' (called "opérateurs") who perform only one aspect of the repair process. These highly skilled workers do not have a watchmaking degree or certificate, but are specifically trained 'in-house' as technicians to service a small number of components of the watch in a true 'assembly-line' fashion, (e.g., one type of worker will dismantle the watch movement from the case, another will polish the case and bracelet, another will install the dial and hands, etc.). If genuine watchmakers are employed in such environments, they are usually employed to service the watch movement.

Due to factory/genuine spare parts restrictions, an increasing minority of watchmakers in the US are 'independent,' meaning that they choose not to work directly for industry or at a factory service center. One major Swiss watch brand – Rolex – now pre-qualifies independent watchmakers before they provide them with spare parts. This qualification may include, but is not limited to, holding a modern training certificate from one of several reputable schools; having a workshop environment that meets Rolex's standards for cleanliness; using modern equipment; and being a member of the American Watchmakers-Clockmakers Institute. The Omega brand has the same approach. However, the vast majority of modern Swiss brands do not sell parts to independent watchmakers, irrespective of the watchmaker's expertise, training or credentials. This industry policy is thought to enable Swiss manufacturers to maintain tighter quality control of the after-sales service for its watch brands, produce high margins on after sales services (two to four times what an independent watchmaker would ask), and to reduce the availability of second-hand watchmaking parts on the used and fake market.