South Down is a parliamentary constituency in the United Kingdom House of Commons. The current MP for the constituency is Chris Hazzard of Sinn Féin.

Christopher John Hazzard is an Irish Sinn Féin politician who has been the Member of Parliament (MP) for South Down since the 2017 United Kingdom general election, when he defeated incumbent Margaret Ritchie of the Social Democratic and Labour Party. Due to Sinn Féin's policy of abstentionism with regard to the Westminster Parliament, Hazzard has not taken his seat.