Section deals with the overriding mandatory rules of the forum and overriding mandatory rules of a third country. At the outset, it defines the provisions relating to the overriding mandatory rules contained in the international conventions especially in the Rome Convention. Subsequently it analyses the overriding mandatory rules regulated by the EU law. These are principally provisions contained in the Rome I Regulation and Rome II Regulation. Finally, it discusses the overriding mandatory provisions of the law of the forum and overriding mandatory provisions of another foreign law regulated by the Private International Law Act. It describes the scope of application of the overriding mandatory rules and analyses the individual provisions relating to these rules contained in the said statutory instruments.