Jeanette Mary Fitzsimons was a New Zealand politician and environmentalist. She was the co-leader of the Green Party of Aotearoa New Zealand from 1995 to 2009, and was a Member of Parliament from 1996 to 2010.

The Green Party of Aotearoa New Zealand, commonly known as Green or the Greens, is a green and left-wing political party in New Zealand. Like many green parties around the world, it has four pillars. The party's ideology combines environmentalism with left-wing and social-democratic economic policies, including well-funded and locally controlled public services within the confines of a steady-state economy. Internationally, it is affiliated with the Global Greens.