John Eder (born January 18, 1969) is a Green Party Leader, social activist, and American politician from the U.S. state of Maine. Eder lives in Portland and is a member of the Maine Green Independent Party, the Maine affiliate of the national Green Party. He has served in the Maine House of Representatives as the legislature's first member of the Green Party for two terms and was elected in 2002 and re-elected in 2004. Until his defeat in 2006 Eder was one of only a handful of independent or third party state legislators in the country and was the highest-ranking elected Green official in the United States.