Declan Breathnach (born 3 June 1958) is an Irish former Fianna Fáil politician who served as a Teachta Dála (TD) for the Louth constituency from 2016 to 2020.

[5] He also was a member of the East Border Regions committee, and served as the chairperson of the Louth County Council Special Policy Group on Infrastructure, European and Cross-Border Matters.

[citation needed] He successfully contested the Louth constituency at 2016 general election, receiving 9,099 first preference votes (13.5%).

[citation needed] Breathnach lost his Dáil seat at the 2020 general election, leaving the Louth constituency without a Fianna Fáil TD for the first time in the history of the state.

On 9 July 2020, Breathnach formally apologised to Sinn Féin President Mary Lou McDonald regarding a tweet from 11 October 2018.