Rolex SA (/ˈroʊlɛks/) is a Swiss luxury watch manufacturer based in Geneva, Switzerland. Originally founded as Wilsdorf and Davis by Hans Wilsdorf and Alfred Davis in London, England in 1905, the company registered Rolex as the brand name of its watches in 1908 and became Rolex Watch Co. Ltd. in 1915. After World War I, the company moved its base of operations to Geneva, Switzerland in order to avoid heavy taxation from a recovering post-war Britain, and in 1920 Hans Wilsdorf registered Montres Rolex SA in Geneva as the new company name which eventually became Rolex SA in later years. Since 1960, the company has been owned by the Hans Wilsdorf Foundation, a private family trust.

Rolex SA and its subsidiary Montres Tudor SA design, manufacture, distribute and service wristwatches sold under the Rolex and Tudor brands. In 2018, Forbes ranked Rolex as the world’s 71st most valuable brand. As of 2018, among the world’s top ten most expensive watches ever sold at auctions, three are Rolex watches. In particular, Paul Newman’s Rolex Daytona currently holds the title of the most expensive wristwatch and the second most expensive watch ever sold at auction, fetching 17.75 million US dollars in New York on October 26, 2017.