The Green Party () is a green political party that operates in the Republic of Ireland and Northern Ireland. As other like-minded Green parties, it has eco-socialist/green left and more moderate factions. It holds a pro-European stance. It was founded as the Ecology Party of Ireland in 1981 by Dublin teacher Christopher Fettes. The party became the Green Alliance in 1983 and adopted its current English language name in 1987 while the Irish name was kept unchanged. The party leader is Eamon Ryan, and the deputy leader is Catherine Martin and the cathaoirleach (chairperson) is Pauline O'Reilly. Green Party candidates have been elected to most levels of representation: local government (in both the Republic and Northern Ireland), Dáil Éireann, the Northern Ireland Assembly, and the European Parliament.
The Green Party first entered the Dáil in 1989. It has participated in the Irish government twice, from 2007 to 2011 as junior partner in a coalition with Fianna Fá