Co-operation between the Green Party and Plaid Cymru

Plaid Cymru and the Green Party of England and Wales have a history of collaborative working, including running candidates together, under the names of both parties. The parties have done this at a number of different elections, including to successfully elect an MP, Cynog Dafis, at the 1992 general election.

While the United Kingdom was part of the European Union, the two parties sat as part of the same European political group, the Greens–European Free Alliance.