Well before online shopping, advertising, and infringement, trademarks resisted territorial confinement. Thanks to mail-order deliveries, broadcasting spillovers, tourism, and immigration, marks might be used, or simply known, beyond their countries of registration.1 The Internet greatly amplifies a preexisting condition of international commerce. As other chapters in this volume detail, trademark law has developed substantive responses to unauthorized supranational exploitation of trademarks.2 This chapter addresses the phenomenon from a litigation perspective: what national court is competent to adjudicate a multiterritorial trademark dispute, and what law applies? While these questions precede e-commerce, the Internet has vastly multiplied their occurrence, thus augmenting the need for fair and predictable solutions.