The Hague Conference on Private International Law (HCCH) is the oldest active international organization with legal capacity in the progressive unification of Private International Law (PIL). The HCCH aims to progressively unify PIL to address legal problems in the form of universal regulations. Thailand is aware of the significance and importance of co-operation in PIL, as shown by the accession of Thailand to the HCCH in 2021. This article will examine Thailand’s situation with a technique employed by Charles Dickens in his heartwarming story, ‘A Christmas Carol,’ which examined one character’s experience with reference to events in the past, the present, and the future. The past will be examined through the genealogy of PIL and the experience of Thailand before joining the HCCH. The present will address the status of Thailand in the HCCH. The future will be discussed as suggestions for Thailand after becoming a Member of the HCCH.

I. Introduction
II. The Origins and Development of PIL
III. The Birth and Evolution of the HCCH
    A. The Beginning
    B. The Expansion of HCCH Membership
    C. The Impact of Secular and Religious Legal Systems
    D. The Accession of the European Union
    E. The Present
IV. The HCCH’s Structure and Its Works
    A. The Organizational Structure of HCCH
    B. The HCCH Instruments
V. The Potential Impact of the HCCH on Thailand
    A. Brief Observation of PIL Studies
    B. Suggestion on the Path Forward
VI. Conclusion

• Patthara Limsira(Assistant Professor at Faculty of Law, Ramkhamhaeng University, Thailand. LL.B.)