The Mainland Judgments in Civil and Commercial Matters (Reciprocal Enforcement) Ordinance (Cap. 645) is the Hong Kong statute under which, since 29 January 2024, an effective judgment of a Mainland Chinese court in a civil or commercial matter can be registered in the Court of First Instance of the Hong Kong High Court and enforced as if it were a Hong Kong judgment, and under which the holder of a Hong Kong judgment can obtain from the Hong Kong court a certified copy of that judgment, and a certificate in respect of it, for recognition and enforcement in the Mainland. The Ordinance implements the Arrangement on Reciprocal Recognition and Enforcement of Judgments in Civil and Commercial Matters by the Courts of the Mainland and of the Hong Kong Special Administrative Region, signed by the Supreme People’s Court and the Government of the HKSAR on 18 January 2019 under Article 95 of the Basic Law. Compared with the earlier regime under Cap. 597, the new statute no longer requires an exclusive choice-of-court clause, covers non-monetary as well as monetary judgments, reaches judgments of courts at every level down to the Primary People’s Courts and extends to a defined range of intellectual property disputes. The registration application is made ex parte, the court fee is HK$1,045, the judgment debtor has 14 days after service of the notice of registration to apply to set the registration aside, and the gateway condition is a default in complying with the judgment that occurred within two years before the application.