This special issue emerged from an ICA pre-conference on Theories in Public Relations, designed to explore the landscape of public relations theory in the current moment. The field of public relations has grown both academically and professionally over the last forty years, and it is now a specialised communication discipline where the most widespread understanding of public relations is primarily a strategic organizational function that nurtures positive relationships with publics and stakeholders for organizations of all kinds: private, public, non-profit, activist, and advocacy. For the first two decades of the field's existence, theories that focused on the organizational roles of public relations-whether as an internal function that helps organizations to function more effectively, or a function that assists organizations to fulfil their social obligations-shaped the vast majority of research in the field. They include Excellence theory and systems theory, but also relationship management, communitarian, rhetorical and dialogic approaches. Each body of work has led to important insights about organizations as instrumental communicators, relationship builders, rhetorical actors, and civil society agents. Over the last two decades, public relations scholarship has extended into other arenas, drawing on perspectives from new scholarly fields (e.g. digital media and network theory, political economy, cultural studies, institutional theory), but also extending its purchase on critical theory that was already in play (e.g. feminism, critical race theory, sociology of media, organizational communication). At the same time, critical analyses of PR that were previously located in the margins of the field have gained greater visibility (L'Etang, McKie, Snow, & Xifra, 2016). As a result, the theoretical landscape of public relations has expanded beyond its organizational origins and now incorporates a much richer range of starting points for multi-faceted analyses of public relations. The field is very much interdisciplinary and many studies are rooted in diverse communication, sociological, cultural, managerial, and organizational knowledge, adapted to public relations-focused inquiries. Despite increasing theoretical depth, however, recognition of the quality and significance of public relations' theoretical contributions beyond the disciplinary domain remains limited. This may be because a universal understanding of the theoretical pillars on which the field is grounded is far from achieved. Arguably, to enjoy greater recognition and academic legitimacy, the theoretical contributions of public relations as a field in its own right must be able to both stand alone and contribute to fields beyond disciplinary boundaries.