Jai Stephen Courtney (; born 15 March 1986) is an Australian actor. He started his career with small roles in films and television series before being cast as Charlie in the action film Jack Reacher (2012). He then went on to star in A Good Day to Die Hard (2013) and I, Frankenstein (2014). He stars alongside Christopher Plummer in the wartime thriller, The Exception (2016)

Courtney had a recurring role as Varro in the television series Spartacus: Blood and Sand (2010). He played Eric in the science fiction action film Divergent (2014), and in 2015, he reprised the role in the sequel, Insurgent. He portrayed Kyle Reese in Terminator Genisys and DC Comics villain Captain Boomerang in the 2016 film Suicide Squad.