Radio K.A.O.S. is the second solo studio album by English rock musician Roger Waters. Released on 15 June 1987 in the United Kingdom and June 16 in the United States, it was Waters' first solo album after his formal split from Pink Floyd in 1985. Like his previous and future studio albums and many works of his during his time with Pink Floyd, the album is a concept album based on a number of key topical subjects of the late 1980s, including monetarism and its effect on citizens, popular culture of the time, and the events and consequences of the Cold War. It also makes criticisms of Margaret Thatcher's government, much like Pink Floyd's The Final Cut (1983), another album conceived by Waters.