The book Psychology of Narcissism - Theory, Research Trends, Interpersonal Relations, and Digital Impact presents a comprehensive and interdisciplinary exploration of narcissism, discussing its conceptual evolution, theoretical models, and evidence-based implications across psychology, social science, and digital culture. This volume provides an overview of current trends in narcissism research, along with a historical overview of narcissism research and a reflection on the most prominent narcissism models. The insightful discussions on the implications of the most recent findings in narcissism research across different contexts, with special emphasis on interpersonal relations and the growing area of the digital environment, along with evidence-based recommendations, can be a valuable resource for researchers and practitioners in various fields and contexts.