Vacheron Constantin (French pronunciation: ​[va.ʃə.rɔ̃ kɔ̃s.tɑ̃.tɛ̃]) is a luxury Swiss manufacture of prestige watches and a brand of the Richemont group. It employs around 1,100 people worldwide, most of whom are based in the manufacturing plants in Geneva and Vallée de Joux. It is an active member of the Federation of the Swiss Watch Industry FH.

Past owners of Vacheron Constantin watches include Napoleon Bonaparte, Pope Pius XI, Edward VIII, and Harry Truman.