The Mutual Assurance Society v. Korn and Wisemiller was a case heard by the United States Supreme Court in 1813. The dispute arose when two individuals, Korn and Wisemiller, purchased an insurance policy from the Mutual Assurance Society to cover their property against fire damage. When their property suffered such damages, they sought compensation from the society but were denied on grounds that they had failed to pay premiums due under the policy. In response, Korn and Wisemiller brought suit against the society for breach of contract claiming that they had not been given proper notice of premium payments prior to being denied coverage. The Supreme Court ultimately ruled in favor of Korn and Wisemiller finding that while it was true that payment notices were sent out late or not at all as required by law; this did not absolve them from liability since there was no evidence presented which showed any prejudice caused by these delays or omissions on behalf of either party involved in this dispute.

In The Mutual Assurance Society v. Korn and Wisemiller, the Supreme Court was asked to decide whether a policy of insurance issued by an association in Philadelphia was valid under Pennsylvania law. The majority opinion held that it was not valid because the association had no legal authority to issue such policies. However, Justice Story dissented from this decision on two grounds: first, he argued that the policy should be considered binding since it had been accepted by both parties; second, he argued that even if there were some technical deficiencies in its formation or execution, those defects could be remedied through equitable relief granted by a court of equity. In conclusion, Justice Story believed that the contract between The Mutual Assurance Society and Korn and Wisemiller should have been enforced as written despite any minor irregularities which may have existed at its inception.