This chapter addresses the harmonization of trademark laws, both substantive law and administrative procedures, within different regional organizations. The topic of regional harmonization and procedural integration of laws is relevant in today’s geopolitical and economic framework considering the importance of trademarks for regional trade as well as the relevance of regional organizations as alternative fora for advancing trade and intellectual property (IP)-related negotiations instead of (or in addition to) multilateral negotiations at the World Trade Organization (WTO) and the World Intellectual Property Organization (WIPO). In particular, this chapter compares four distinct regional organizations in order to highlight different levels...