In disputes involving international elements, the mere fact that proceedings are brought before Thai courts does not necessarily mean that Thai law will be applied to determine the merits of the case. Rather, such disputes must be assessed under the principles of conflict of laws, which serve as a fundamental mechanism for determining which legal system should govern a dispute that is connected to multiple jurisdictions.
Conflict of laws does not function to determine substantive rights or liabilities. Instead, it operates as a system of choice-of-law rules that directs the court to the most appropriate legal framework for resolving the dispute. In the Thai context, these principles play a particularly significant role in cross-border commercial disputes, which frequently involve parties of different nationalities, transnational transactions, and factual circumstances spanning multiple jurisdictions.
The Role of Conflict of Laws in Thai Court Proceedings
When a case is brought before a Thai court, the court will undertake a sequential analysis. It will first determine whether it has jurisdiction to hear the matter. Once jurisdiction is established, the court will then proceed to consider which law should be applied to the dispute.
At this stage, conflict-of-laws principles come into operation through the identification of relevant connecting factors. These factors are used to determine which legal system has the closest and most real connection to the dispute. Such factors may include, among others, the place of contract formation, the place of contractual performance, the nationality or domicile of the parties, and the place where a tort occurred. The Thai courts will assess these elements holistically in order to identify the governing law.
In practice, where the parties have expressly agreed upon a governing law in their contract, Thai courts will generally uphold such choice. However, this principle is subject to an important limitation: the chosen law must not be contrary to public order or good morals. This serves as a critical safeguard within the Thai legal system.
Complexities in Proving Foreign Law
Although conflict-of-laws rules may lead to the application of foreign law, Thai courts do not take judicial notice of foreign law. Accordingly, the party relying on foreign law bears the burden of proving its content before the court.
In practice, foreign law is typically established through expert witnesses, who may present legal opinions or testify before the court. However, this process often gives rise to conflicting expert evidence, particularly where the foreign legal system is complex or where divergent judicial interpretations exist.
Furthermore, differences in language and legal context may result in inaccuracies in translation or interpretation. These challenges introduce a degree of uncertainty into the proceedings and may materially affect the outcome of the case.
Limitations: Public Order and Good Morals
While Thai courts generally respect the parties’ autonomy in selecting the governing law, the application of foreign law remains subject to the overriding principle of public order and good morals.
If the court determines that the application of foreign law would be inconsistent with the fundamental principles of Thai law or detrimental to public interests, it may refuse to apply such law and instead substitute Thai law in respect of the relevant issue.
This limitation reflects a balance between respecting party autonomy and safeguarding the integrity of the domestic legal system.
Strategic Dimension: Conflict of Laws as a Tool
In practice, conflict of laws is not merely a technical doctrine. Rather, it constitutes a strategic tool that may be deployed by parties to gain a procedural or substantive advantage in litigation.
A carefully considered choice of governing law may significantly influence the scope of rights and obligations, as well as the applicable standards of liability, potentially favouring one party over the other. Likewise, aligning jurisdictional clauses with governing law provisions can reduce procedural uncertainties and enhance enforceability.
In certain cases, parties may also raise conflict-of-laws arguments as part of their litigation strategy. For example, a party may argue for the application of a legal system with a more favourable liability regime, or challenge the applicability of the law relied upon by the opposing party on jurisdictional or connecting-factor grounds.
Conclusion
Conflict of laws constitutes a critical component of cross-border litigation in Thailand, serving as the mechanism by which disputes are connected to the most appropriate legal system. Its importance, however, extends beyond theory. It has direct implications for litigation strategy, legal outcomes, and the commercial interests of the parties involved.
Investors and business operators who possess a sophisticated understanding of conflict-of-laws principles are better positioned to structure contracts and legal strategies effectively, mitigate dispute-related risks, and enhance their competitive advantage in cross-border transactions over the long term.
Disclaimer
This article has been prepared solely for the purpose of providing general legal information. It is not intended to constitute legal advice. The information contained herein may not be comprehensive and may not reflect the most current legal developments. Readers should not rely on this article as a substitute for professional legal advice, which must be provided based on the specific facts and circumstances of each case. The dissemination or use of this article does not give rise to any lawyer–client relationship. All rights are reserved in accordance with the Thai Copyright Act B.E. 2537 (1994).
Author: Pinprapus Chartikavanich
Date: 8 April 2026