Tomás Mac Giolla (Irish pronunciation: [ˈt̪ˠʊmˠaːsˠ mˠək ˈɟɪl̪ˠə]; born Thomas Gill; 25 January 1924 – 4 February 2010) was an Irish Workers' Party politician who served as Lord Mayor of Dublin from 1993 to 1994, Leader of the Workers' Party from 1962 to 1988 and President of Sinn Féin from 1962 to 1970. He served as a Teachta Dála (TD) for the Dublin West constituency from 1982 to 1992.