Judi Bari (November 7, 1949 – March 2, 1997) was an American environmentalist and labor leader, a feminist, and the principal organizer of Earth First! campaigns against logging in the ancient redwood forests of Northern California in the 1980s and '90. She also organized efforts through Industrial Workers of the World Local 1 to bring timber workers and environmentalists together in common cause. Judi Bari died of breast cancer on March 2, 1997. Bari was the daughter of mathematician Ruth Aaronson Bari and sister of the New York Times science journalist Gina Kolata.