"Say It Isn't So" is a popular torch song by Irving Berlin, published in 1932. The song was written when Berlin was suffering a loss of confidence following several setbacks, and he initially placed the song in a drawer, feeling that it would not be successful. However, one of Berlin's employees, Max Winslow, heard it, and on his own initiative, took it to Rudy Vallée, who was then a major star on radio. Vallee sang it on his radio show and it became an immediate hit.