"A Foreign Affair" is a song written and produced by Australian group Client Liaison, featuring Tina Arena. The song was released on 30 August 2017 as the fourth and final single from Client Liaison's debut studio album Diplomatic Immunity (2016).

Client Liaison is an Australian indie pop duo made up of vocalist Monte Morgan, and keyboardist and producer Harvey Miller. The pair first came to prominence in 2012 after the release of their first music video "End of the Earth", and went on to release a self-titled EP in 2014, and studio album Diplomatic Immunity in 2016. Their second studio album, Divine Intervention was released on 1 October 2021.