Every year, each of the 50 United States state supreme courts decides hundreds of cases.
Of those cases dealing with state law, a few significantly shape or re-shape the law of their state or are so influential that they later become models for decisions of other states or the federal government, or are noted for being rejected by other jurisdictions.
The same is true of those cases involving a federal question, except that these may be appealed to the United States Supreme Court.
Appealed decisions that are notable primarily because of later actions of the U.S. Supreme Court covered in the listings of U.S. Supreme Court cases.
The decisions are listed in chronological order.