Judith Beatrice Bari was an American environmentalist, feminist, and labor leader, primarily active in Northern California after moving to the state in the mid-1970s. In the 1980s and 1990s, she was the principal organizer of Earth First! campaigns against logging in the ancient redwood forests of Mendocino County and related areas. She also organized Industrial Workers of the World Local 1 in an effort to bring together timber workers and environmentalists of Earth First! in common cause.

Earth First! is a radical environmental advocacy group that originated in the Southwestern United States. It was founded in 1980 by Dave Foreman, Mike Roselle, Howie Wolke, Bart Koehler, and Ron Kezar. Today there are Earth First groups around the world including ones in Australia, Belgium, Canada, the Czech Republic, France, Germany, India, Ireland, Italy, Mexico, the Netherlands, Nigeria, New Zealand, the Philippines, Poland, Slovakia, Spain, the United Kingdom, and the United States.