Ivana Catherine Bacik is an Irish Labour Party politician who has been Leader of the Labour Party since 24 March 2022 and a Teachta Dála (TD) for the Dublin Bay South constituency since winning a by-election on 9 July 2021. Bacik previously served as Leader of the Labour Party in the Seanad from 2011 to 2021, and a Senator for the Dublin University constituency from 2007 to 2021. She previously served as Deputy leader of Seanad Éireann from 2011 to 2016.

The Labour Party is a centre-left and social-democratic political party in the Republic of Ireland. Founded on 28 May 1912 in Clonmel, County Tipperary, by James Connolly, James Larkin, and William O'Brien as the political wing of the Irish Trades Union Congress, it describes itself as a "democratic socialist party" in its constitution.