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Category: File - :1625 Massachusetts Avenue, NW.JPG|thumb|Offices for Earthjustice in Washington, D.C.

Earthjustice is a non-profit public interest law firm based in the United States that specializes in environmental litigation.

It was founded in 1971 by two volunteer lawyers working with the Sierra Club, Don Harris and Fred Fisher, under the name "Sierra Club Legal Defense Fund", a fully independent organization from the Sierra Club. It changed its name to Earthjustice in 1997 to better reflect its role as a legal advocate representing hundreds of regional, national and international organizations and associations. As of January 2009, the group has provided free legal representation to more than 600 clients ranging from The Wilderness Society, the Natural Resources Defense Council, the National Audubon Society, and the American Lung Association to smaller state and community coalitions, such as the Alaska Center for the Environment and Friends of the Everglades.

It employs about 50 attorneys who represent citizen groups, scientists, fishing organizations, and others in litigation in federal and state courts. Its docket includes precedent-setting cases involving wildlife, national forests, national parks, air pollution, water pollution, transportation, agriculture, and many other matters. The organization has offices in Oakland, California (headquarters); Bozeman, Montana; Juneau, Alaska; Honolulu, Hawaii; Seattle, Washington; Denver, Colorado; Tallahassee, Florida; New York City; and Washington, D.C.