Upsurge is a novel by Australian writer J. M. (John Mews) Harcourt. Set in Perth, Western Australia, during the Great Depression, it was the first novel to be banned by the-then Commonwealth Book Censorship Board and the first to be prosecuted by police in Australia. University of New South Wales academic Richard Nile described Upsurge as "one of the most radical Australian books written during the interwar period". It was admired by Katharine Susannah Prichard, who said it was the first Australian novel to be written in the socialist realism style.