Las Vegas (Spanish: "The Meadows") is the most populous city in the state of Nevada, the seat of Clark County, and an internationally renowned major resort city for the gaming industry, shopping, and entertainment. Las Vegas, billed as The Entertainment Capital of the World, is famous for the number of large casino resorts and their associated entertainment. The city's tolerance for various forms of adult entertainment earned it the title of Sin City, and this image has made Las Vegas a popular setting for films and television programs. Outdoor lighting displays are everywhere on the Las Vegas Strip and are seen elsewhere in the city as well; as seen from space, Las Vegas is the brightest city on earth.

Established in 1905, Las Vegas officially became a city in 1911. With the growth that followed, at the close of the century Las Vegas was the most populous American city founded in the 20th century (a distinction held by Chicago in the 19th century). It was the 28th most populous city in the United States during the 2000 census. The population of the city was most recently estimated at 558,880 and the Las Vegas metropolitan area exceeds 1.8 million residents.

The name Las Vegas is often applied to the unincorporated areas of Clark County that surround the city, especially the resort areas on and near the Las Vegas Strip. This 4.5-mile (7.2-km) stretch of Las Vegas Boulevard is mostly outside the city limits, in the unincorporated towns of Paradise and Winchester.