Texas v. New Mexico and Colorado, 141-orig, ___ U.S. ___ (2018), was a Supreme Court case argued and decided during the 2017 term of the Supreme Court of the United States. The case involved an interstate dispute regarding New Mexico's compliance with the Rio Grande Compact of 1938, an agreement which established a plan for equitable apportionment of the water in the Rio Grande Basin among the states of Colorado, New Mexico, and Texas. The Court considered the question of whether the US federal government had a legal right to join litigation against New Mexico; the Court ruled that the federal government was within its rights when it did so.