The phrase "what happens in Vegas stays in Vegas" is a slogan and advertising campaign for the city of Las Vegas, Nevada. The slogan was created in 2003 by the Las Vegas Convention and Visitors Authority and advertising agency R&R Partners. The idea behind the slogan was to brand Las Vegas as more than a gambling destination, promoting adult freedom and empowerment. The slogan deliberately communicates freedom. When you come to Las Vegas, you can do anything and be anything you want to be. You can spend the money you work so hard to save; you can have the extra drink you’d normally decline after dinner. The slogan has turned out to be one of the most successful marketing campaigns in the tourism industry.

The phrase is often used to mean that any scandalous activities that happen when one travels in a group are not to be discussed with other people afterward. The phrase can also be used simply to emphasize that something needs to be kept secret. The phrase is an allusion to the former advertising slogan of Las Vegas, Nevada ("What Happens Here, Stays Here"), a popular vacation destination with a reputation for hedonism.