John Lahart is an Irish Fianna Fáil politician who has been a Teachta Dála (TD) for the Dublin South-West constituency since the 2016 general election.

[1][2] Lahart is from Ballyroan, County Dublin where he was educated at Scoil an Spiorad Naomhin[3] and then by the Christian Brothers at Coláiste Éanna.

[6] In October 2014, Lahart was the unsuccessful Fianna Fáil candidate in the Dublin South-West by-election, winning only 8.6% of the first-preference votes (FPV).

[8] Lahart described the challenge of getting known in the constituency,[9] and in 2015 Fianna Fáil leader Micheál Martin explained the by-election as part of a medium term plan of building a "platform" for the 2016 general election.

[12][13] In June 2020, Fianna Fáil, Fine Gael and the Green Party negotiated a deal to form a coalition government, and Lahart was tipped as a possible Minister of State.