Whaam! is a diptych painted by American artist Roy Lichtenstein in 1963. One of the best-known works of pop art, it is among Lichtenstein's most important paintings. Whaam! was first exhibited at the Leo Castelli Gallery in New York City in 1963, and purchased by the Tate Gallery, London, in 1966. It has been on permanent display at Tate Modern since 2006.