Liadh Ní Riada (pronounced [ˈl̠ʲiə n̠ʲiː ˈɾˠiəd̪ˠə]; born 28 November 1966) is an Irish cultural activist and former Sinn Féin politician who served as a Member of the European Parliament (MEP) for the South constituency from 2014 to 2019.

In July 2020, Comharchumann Forbartha Mhúscraí, a Ballingeary-based community development co-operative for the Muskerry Gaeltacht, appointed Ní Riada as language planning officer, to encourage use of Irish in the area.

[9] Three years later, in 2014, Ní Riada was selected as the Sinn Féin candidate for the South constituency for the 2014 European Parliament elections.

Ní Riada ran her 2014 campaign for the European Parliament on an anti-austerity message, calling for job creation and an end to forced emigration from Ireland.

[10] As an MEP, Ní Riada sat on three Committees of the European Parliament: Budgets, Culture and Education, and Fisheries.

In March 2021 Sinn Féin selected her to contest Cork North-West at the next Dáil election (which was eventually held in 2024) but in 2023 she announced that she was leaving politics.