Phoebe Jane Elizabeth Tonkin (born 12 July 1989) is an Australian actress. Born and raised in Sydney, she began her career on Australian television and had her breakthrough playing Cleo Sertori in the Network Ten fantasy series H2O: Just Add Water (2006–2010), for which she received acclaim and was nominated for the AACTA Award for Best Actress. Tonkin made her film debut as Fiona Maxwell in Stuart Beattie's apocalyptic war film Tomorrow, When the War Began (2010). After starring in the horror film Bait 3D (2012), she relocated to America, where she received acclaim for her roles as Faye Chamberlain in the CW supernatural drama series The Secret Circle (2011–2012) and Hayley Marshall in The Vampire Diaries (2012–2013) and The Originals (2013–2018).

Tomorrow, When the War Began is a 2010 Australian action-adventure war drama film written and directed by Stuart Beattie and based on the 1993 novel of the same name by John Marsden. The film was produced by Andrew Mason and Michael Boughen. The story follows Ellie Linton, one of seven 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.