The Frances, Boyer, Master (French's Claim) was a case heard by the United States Supreme Court in 1814. The case involved a dispute between two parties over ownership of a vessel called the Frances and its cargo. French claimed that he had purchased the vessel from an individual named Boyer who had been appointed as master of it by another party known as Master. However, upon inspection of documents related to the sale, it became clear that there were discrepancies regarding whether or not French actually owned the ship and its cargo at all. The court ultimately ruled in favor of French due to his possession of certain documents which proved his claim to be true; however, they also noted that further investigation into this matter may have been necessary if such evidence did not exist.

In The Frances, Boyer, Master (French's Claim), the Supreme Court was tasked with determining whether a French citizen could bring suit in an American court. Chief Justice Marshall wrote the dissenting opinion and argued that although there is no express provision in any law of Congress allowing such suits to be brought by foreign citizens, it does not necessarily follow that they are prohibited from doing so. He further noted that if Congress had intended to deny foreigners access to U.S. courts then it would have done so explicitly rather than leaving it up for interpretation as this case did. Furthermore, he stated that since France has allowed similar cases against its own citizens before their own tribunals then America should do the same out of respect for international comity and reciprocity between nations. In conclusion, Chief Justice Marshall believed that French citizens should be able to bring suit in American courts just like any other person who meets all necessary requirements under U.S law regardless of nationality or citizenship status