Wager et al. v. Hall was a case heard by the United States Supreme Court in 1872. The case involved a dispute between two parties over the ownership of a piece of land in the state of Ohio. The plaintiff, Wager, claimed that he had purchased the land from the defendant, Hall, in 1867. Hall, however, argued that the sale was invalid because he had not been given proper notice of the sale. The Supreme Court ultimately sided with Hall, ruling that the sale was invalid because Hall had not been given proper notice of the sale. The Court held that Hall had a right to be notified of the sale, and that the lack of notice rendered the sale invalid. The Court also held that Hall was entitled to the return of the purchase price, as well as any other damages he may have suffered as a result of the invalid sale. In conclusion, the Supreme Court ruled in favor of Hall, finding that the sale of the land was invalid due to the lack of proper notice. The Court ordered the return of the purchase price, as well as any other damages Hall may have suffered as a result of the invalid sale.

In Wager et al. v. Hall, the Supreme Court was asked to decide whether a contract between two parties that had been made in good faith and without fraud could be voided because of an error in its terms. The majority opinion held that such contracts should not be set aside due to mistake or inadvertence, but rather enforced according to their literal terms as long as they were entered into with good faith and without fraud or misrepresentation on either side. Justice Field dissented from this decision, arguing that when one party has been misled by another's mistake regarding the contents of a contract, it is unjust for them to suffer any loss resulting from it; thus he argued that courts should have discretion over enforcing contracts based on mistakes so as to prevent injustice where possible.