Patrick Costello (born 21 May 1980)[1][2] is an Irish former Green Party politician who served as a Teachta Dála (TD) for the Dublin South-Central constituency from 2020 to 2024.

[5] After graduating, Costello worked in a variety of front line roles in homeless agencies and services for adults and children.

Costello is a board member of Clay Youth Project in Crumlin and served as a Human Rights Observer in Palestine with EAPPI.

In December 2020 Costello, alongside fellow Green TD Neasa Hourigan, raised major concerns about the entry of Ireland into the Comprehensive Economic and Trade Agreement (CETA), a trade agreement between Canada and members of the EU, due to fears about the proposed investment court system.

The investment court system is designed to act as a method of solving business disputes between investors and participating countries.

[12] 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.