With the field of personal relationships continuing to see significant growth over the past quarter century, The Cambridge Handbook of Personal Relationships stands as a crucial benchmark of the current state of scholarship. This third edition presents new chapters addressing significant changes in techniques for studying relationships and examining recent emphases on technology and diverse relationships while also featuring a fresh analysis of current research foci and applications. By synthesizing theoretical and empirical literature, the work not only traces the discipline’s historical roots but recommends future directions, marking an important step forward in improving research and theory on personal relationships. Featuring contributions from internationally known experts who have significantly enhanced relationship research in multiple fields including psychology, communication, family studies, and sociology, it is an essential resource for researchers, graduate students, and practitioners alike.