Where the parties to an international contract fail to specify the choice of law, a forum selection agreement is one of the most, if not the most, significant factors to consider in implying the choice of law in many international, supranational, regional instruments, and national jurisdictions. However, it is an ill-defined, notoriously complex, and hotly debated issue as to the weight that ... [Show full abstract] should be attached to a forum selection agreement in implying the choice of law. Hence, this article is devoted to discussing this topic from a comparative perspective, in order to propose a guide to global uniform criteria. To achieve this, the article covers all relevant international, regional, and supranational instruments, and selected legal systems in Africa, Asia, Australasia, Europe, the Middle East, and North and South America. The legal systems compared include those from the global North and global South, including common law, civil law, and mixed legal systems. The article’s core proposal is that an exclusive forum selection agreement should be a key factor in implying the choice of law. However, except in such cases as where a forum is chosen on a neutral basis, there should be a general requirement of corroboration with at least one other factor of significance. The aim of the proposal is to contribute to greater uniformity, predictability, and certainty in the global community in this field of law.