
Mary Louise McDonald, Irish politician and President of Sinn Féin since February 2018, is born in Dublin on May 1, 1969.
McDonald is born into a middle-class family in south Dublin. Her father Patrick McDonald, a builder and surveyor, and her mother Joan, separate when she is nine years old, and she stays with her mother in Rathgar. She has three siblings, one older and two younger. Her great-uncle, James O’Connor, was a member of the Anti-Treaty IRA and was executed at the Curragh Camp during the Irish Civil War.
McDonald is educated at Rathgar National School and at the Catholic all-girls, Notre Dame des Missions in Churchtown, South Dublin, where she is involved in debating. She then attends Trinity College Dublin (TCD), the University of Limerick and Dublin City University (DCU), studying English Literature, European Integration Studies and Human Resource Management.
She works as a researcher for the Institute of European Affairs, a consultant for the Irish Productivity Centre, a human resources consultancy that is jointly operated by Ibec and Irish Congress of Trade Unions (ICTU), and a trainer in the Partnership Unit of the Educational and Training Services Trust.
McDonald starts her political career by first joining Fianna Fáil in 1998 but leaves the party after a year due to core policy differences, particularly in relation to Northern Ireland and social justice. She quickly realises that Sinn Féin is a more appropriate party for her Republican views after meeting Sinn Féin members through the Irish National Congress.
She first runs for office at the 2002 Irish general election when she unsuccessfully contests the Dublin West constituency for Sinn Féin, polling 8.02% of first preference votes.
In 2004, McDonald becomes Sinn Féin’s first Member of the European Parliament (MEP) in Ireland, when she is elected at the 2004 European Parliament election in Ireland for the Dublin constituency, receiving over 60,000 first preference votes. She serves until 2009 and is a prominent member of the Employment and Social Affairs committee and Civil Liberties committee.
McDonald is an unsuccessful candidate in the Dublin Central constituency at the 2007 Irish general election. In 2009 she becomes the vice president of Sinn Féin.
McDonald contests the Dublin Central constituency again at the 2011 Irish general election, this time picking up 13.1% of first preference votes. She is successful in taking the last seat in the constituency. Following the election, she becomes Sinn Féin’s Spokesperson for Public Expenditure and Reform and is a member of the Public Accounts Committee from then until 2017.
After her re-election to the Dáil at the 2016 Irish general election, in which she tops the poll in Dublin Central, she becomes Sinn Féin’s All-Ireland Spokesperson for Mental Health and Suicide Prevention, which she holds until being elected president of Sinn Féin in 2018.
At a Sinn Féin party conference on November 18, 2017, Gerry Adams is re-elected party leader but announces that he will ask party leadership to call for a special Ard Fheis to be held within three months to choose a new president, and that he will not stand for re-election as TD for the Louth constituency in the next election.
At the close of nominations to succeed Adams on January 20, 2018, McDonald is announced as the president-elect of Sinn Féin, as she is the sole nominee to enter the race. She is confirmed as president at a special Ard Fheis on February 10, 2018, in Dublin.
McDonald is nominated as Taoiseach on February 20, 2020, but is defeated 45 to 84. On June 26, 2020, Fianna Fáil, Fine Gael, and the Green Party form a coalition government, leaving Sinn Féin as the largest opposition party, and McDonald as Leader of the Opposition. She dismisses the coalition agreement as a “marriage of convenience,” and accuses Fianna Fáil and Fine Gael of conspiring to exclude Sinn Féin from government.
At the 2024 Irish general election, McDonald is re-elected to the Dáil topping the poll in Dublin Central with Sinn Féin increasing their seat share by two seats, remaining the second largest party by representation in the Dáil and attaining 19% of the first preference votes, a fall of 5.5% from 2020 and fall behind Fianna Fáil by 2.9% and Fine Gael by 1.8%.
McDonald is again nominated as Taoiseach on December 18, 2024, but is defeated 44 to 110.
McDonald’s husband, Martin Lanigan, works as a gas control superintendent for the emergency dispatch division of Gas Networks Ireland, a state infrastructure provider. They have two children and live in Cabra, Dublin.



