Jack Entratter, nicknamed "Mr. Entertainment", was an American business executive. He is best known for management positions at the Copacabana nightclub in New York City in the 1940s and early 1950s, and at the iconic Sands Hotel and Casino in Las Vegas from the early 1950s. He is closely associated with Frank Sinatra and the Rat Pack in the history of Las Vegas.

The Sands Hotel and Casino was a historic American hotel and casino on the Las Vegas Strip in Paradise, Nevada, United States, that operated from 1952 to 1996. Designed by architect Wayne McAllister, with a prominent 56-foot (17 m) high sign, the Sands was the seventh resort to open on the Strip. During its heyday, it hosted many famous entertainers of the day, most notably the Rat Pack and Jerry Lewis.