R v Commonwealth Court of Conciliation and Arbitration; Ex parte BHP, was an early decision of the High Court of Australia concerning the jurisdiction of the Commonwealth Court of Conciliation and Arbitration in which the High Court controversially, granted prohibition against the Arbitration Court to prevent it from enforcing aspects of an industrial award. The High Court held that the Arbitration Court had gone beyond settling the dispute that had been submitted to it and in doing so had made a jurisdictional error.