Held v. Montana is a constitutional court case in the State of Montana regarding the right to a "clean and healthful environment in Montana for present and future generations":Art. IX, § 1 as required by the Constitution of Montana. The case was filed in March 2020 by Our Children's Trust on behalf of sixteen youth residents of Montana, then aged 2 through 18. On June 12, 2023, the case became the first climate-related constitutional lawsuit to go to trial in the United States.
The plaintiffs argued that the state's support of the fossil fuel industry had worsened the effects of climate change on their lives, thus depriving them of their constitutional rights.