Liadh Ní Riada (pronounced [ˈl̠ʲiə n̠ʲiː ˈɾʲiəd̪ˠə]; born 28 November 1966) is an Irish Sinn Féin politician who formerly served as a Member of the European Parliament (MEP) for the South constituency from 2014 to 2019. She was the Sinn Féin candidate in the 2018 presidential election. As of July 2020, Ní Riada is an Irish language planning officer for the Gaeltacht in Muskerry, County Cork.