Tomorrow, When the War Began is a 2010 Australian drama film written and directed by Stuart Beattie and based on the novel of the same name (the first in a series of seven) by John Marsden. The film was produced by Andrew Mason and Michael Boughen. The story follows Ellie Linton, one of eight teenagers waging a guerrilla war against an invading foreign power in their fictional hometown of Wirrawee. The film stars Caitlin Stasey as Ellie Linton and features an ensemble cast including Rachel Hurd-Wood, Lincoln Lewis and Phoebe Tonkin.
Production began in September 2009.Principal photography began on 28 September 2009, and concluded on 6 November 2009; filming took place in the Hunter Region and the Blue Mountains, in New South Wales.
The teaser trailer for the film was released on 31 March 2010.