This thesis examines problems concerning international standard-essential patent licensing disputes within the EU from a private international law perspective. Furthermore, it seeks to analyse the jurisdictional rules which are established by the Brussels Ia Regulation when applied to cross-border SEP licensing disputes. The backdrop for the present study is the system of international standardisation and the licensing of those patents which are essential to the implementation of a technical standard. It is primarily concerned with EU law as it relates to technical standardisation in the field of telecommunications, since it plays a significant role in today’s global information society. As a rule, SEP holders make a commitment to license their essential patents according to terms which are fair, reasonable and non-discriminatory (FRAND). In order to fulfil the aim of the thesis, the legal nature of such a FRAND commitment has been examined, finding that it should be characterised as an enforceable contract for the benefit of third parties. Patent rights have traditionally been thought of as territorial in nature, which raises questions regarding the possibilities for cross-border enforcement, as well as how the rules on jurisdiction should be applied by national courts in the EU when faced with international disputes where the subject matter is considered to be, to an extent, territorially bound. One of the fundamental questions that arise out of this is how, in the context of SEP licensing, the legal framework for SEP disputes affects the application of the jurisdictional rules in cross-border cases. As a consequence of the lack of harmonisation as well as legal regulation and guidance relating to SEP licensing, individual courts in Europe have developed their own distinct approaches and methodologies in SEP disputes. There is a risk that this lack of uniformity leads not only to greater legal uncertainty, but also widespread patent litigation. In particular, recent case law from Germany and the United Kingdom has been influential in creating a precedent that national courts are able to set FRAND licensing terms which are global in scope. This has led to certain courts taking a more active approach in international SEP disputes—even if they concern foreign patents—granting injunctions which in some cases seek to limit the jurisdiction of foreign courts. It seems to follow from this that a ‘race to the courthouse’ is to be expected in SEP disputes, which is further facilitated by the ample room for forum shopping that exists in the Brussels Ia Regulation. Lastly, the thesis also deals, in part, with the new unitary patent system, as well as the Unified Patent Court and the question of how the UPC may come to affect the future of SEP disputes within the EU. Appropriate solutions to the identified problems are discussed, favouring either a concentration of SEP litigation to one forum, or the development of guiding principles so as to increase legal certainty.