The Rat Pack is the nickname given to a group of entertainers most active between the mid-1950s and mid-1960s. Its most famous line-up featured Frank Sinatra, Dean Martin, Sammy Davis Jr., Peter Lawford, and Joey Bishop. The group was famous for the way they improvised on stage with dancing, singing and cracking jokes with the audience.

There is also a UK rave group from the early '90s who used the name The Rat Pack who had hits with tracks like "Searchin' for my rizzla"