An atelier (French: [atəlje]) is the private workshop or studio of a professional artist in the fine or decorative arts or an architect, where a principal master and a number of assistants, students, and apprentices can work together producing fine art or visual art released under the master's name or supervision.
Ateliers were the standard vocational practice for European artists from the Middle Ages to the 19th century, and common elsewhere in the world. In medieval Europe this way of working and teaching was often enforced by local guild regulations, such as those of the painters' Guild of Saint Luke, and of other craft guilds. Apprentices usually began working on simple tasks when young, and after some years with increasing knowledge and expertise became journeymen, before possibly becoming masters themselves. This master-apprentice system was gradually replaced as the once powerful guilds declined, and the academy became a favored method of training. However, many professional artists continued using students and assistants as they had been in ateliers; sometimes the artist paid the student-assistants, while sometimes they paid the artist fees to learn.