4 Change Joe O'Brien Green A by-election was held in the Dáil Éireann Dublin Fingal constituency in Ireland on Friday, 29 November 2019, to fill the vacancy left by the election of Independents 4 Change TD Clare Daly to the European Parliament.

[1] The Electoral (Amendment) Act 2011 stipulates that a by-election in Ireland must be held within six months of a vacancy occurring.

[5] The election was won by Fingal County Councillor Joe O'Brien of the Green Party.

Karen Power was co-opted to O'Brien's seat on Fingal County Council following his election to the Dáil Among the candidates were 2 Senators Lorraine Clifford-Lee and James Reilly and four Fingal County Councillors Ann Graves, Dean Mulligan, Joe O'Brien and Duncan Smith.

During the campaign, the Fianna Fáil candidate Lorraine Clifford-Lee was embroiled in controversy when she had to apologise for the language she had used in tweets she had made in 2011, which were derogatory towards the Traveller community.