The Oaths Act, 1873, was a statute passed by the Parliament of Canada in 1873 which authorized any committee of the Senate or House of Commons to examine witnesses under oath. The enactment was subsequently disallowed by the government of the United Kingdom as it was deemed ultra vires. The Oaths Act, 1873 is the only instance of an enactment of Canadian Parliament to be disallowed by the government of the United Kingdom.