The Green Party of England and Wales (GPEW; Welsh: Plaid Werdd Cymru a Lloegr, often simply the Green Party or Greens) is a green, left-wing political party in England and Wales. Headquartered in London, Carla Denyer and Adrian Ramsay have served as co-leaders since October 2021. The Green Party currently has one representative in the House of Commons and two in the House of Lords. It also has hundreds of councillors at the UK local government level and three members of the London Assembly.

The party's ideology combines environmentalism with left-wing economic policies, including well-funded and locally controlled public services. It advocates a steady-state economy with regulated capitalism, and supports proportional representation. It also takes a progressive approach to social policies such as civil liberties, animal rights, LGBT rights, and drug policy reform. The party also believes strongly in non-violence, universal basic income, a living wage, and democratic participation. They comprise various regional divisions, including the semi-autonomous Wales Green Party. Internationally, the party is affiliated to the Global Greens and the European Green Party.

The Green Party of England and Wales was established in 1990 alongside the Scottish Greens and the Green Party Northern Ireland through the division of the pre-existing Green Party, a group that had initially been established as the PEOPLE Party in 1973. The party went through centralising reforms spearheaded by the Green 2000 group in early 1990, and also sought to emphasise growth in local governance, doing so throughout 1990. In 2010, the party gained its first Member of Parliament (MP) in former leader Caroline Lucas, who represents the constituency of Brighton Pavilion.