Royal British Bank v Turquand (1856) 6 E&B 327 is a UK company law case that held people transacting with companies are entitled to assume that internal company rules are complied with, even if they are not. This "indoor management rule" or the "Rule in Turquand's Case" is applicable in most of the common law world. It originally mitigated the harshness of the constructive notice doctrine, and in the UK it is now supplemented by the Companies Act 2006 sections 39-41.