Undisclosed Principal In agency law, a principal who is not known to the third party with whom their agent interacts. The undisclosed principal may still be liable for the acts of their agent under certain circumstances. The buyer unknowingly entered into a contract with an undisclosed principal, who is now liable for the terms of the agreement. While not as common, undisclosed principal cases can arise in commercial transactions. For example, Si memorized v. Rother (1843) addressed the rights of undisclosed principals. ← Back to BrowseNext Term →