Neasa Hourigan (born October 1980) is an Irish Green Party politician who was a Teachta Dála (TD) for the Dublin Central constituency from 2020 until 2024.

[18][19][20] On 17 May 2022 Costello and Hourigan were both suspended from the Green Party for six months after they voted against the government on a motion calling for the new National Maternity Hospital to be built on land wholly owned by the state.

Senator and Green Party Chair Pauline O'Reilly rebuked Hourigan's remarks and said that it was "clear Neasa didn't have all the facts".

[25] On 22 March 2023 Hourigan was suspended from the Green Parliamentary Party for fifteen months and removed from her committee position for voting against the government on an amendment to a Sinn Féin motion calling for the extension of the eviction ban.

[26] On 14 July 2024, Hourigan was narrowly defeated by Senator Róisín Garvey in an election to replace Catherine Martin as deputy leader of the Green Party.

[28] Hourigan believes the climate and biodiversity crises are urgent issues and has expressed concern over the role of large multinational corporations in driving environmental harm.

On the issue of government funding, Hourigan is critical of Ireland’s reliance on corporate tax receipts, which she views as an unreliable source of income.

She has also called for long-term, multi-annual funding in place of the current annual budget and electoral cycles, believing this would allow for a more consistent and effective response to the climate crisis.

[29] Hourigan supports relocating Dublin Port to create space for housing development and reduce pollution in the city, suggesting that rail integration could help manage port-related traffic.

She rejects accusations that criticising the actions in Gaza is antisemitic, affirming that Ireland, as a neutral country, has a valid position based on human rights.