Matthew James Thistlethwaite (born 6 September 1972) is an Australian politician. He has been an Australian Labor Party member of the Australian House of Representatives since 2013, representing the electorate of Kingsford Smith. He was formerly a member of the Australian Senate from 2011 to 2013. Since 1 June 2022, Thistlethwaite has served as Assistant Minister for Defence, Veterans' Affairs and the Republic in the ministry of Anthony Albanese.