In an era marked by rapid globalization, technological disruption, and evolving workforce dynamics, effective leadership and a deep understanding of organizational behavior have become essential for sustainable success. Organizations today operate in complex and competitive environments where the ability to inspire people, manage change, foster collaboration, and build a positive organizational culture determines long-term performance and growth. Leadership and Organizational Behavior is designed to provide a comprehensive understanding of how individuals and groups function within organizations and how effective leadership shapes organizational outcomes. This book explores the dynamic relationship between human behavior, managerial practices, and organizational effectiveness, offering both theoretical foundations and practical insights. The book begins by introducing the fundamental concepts of organizational behavior, including individual differences, personality, perception, attitudes, motivation, and learning. It then progresses to group dynamics, communication, teamwork, conflict management, power, and organizational culture. The leadership component examines various leadership theories—trait, behavioral, contingency, transformational, and contemporary approaches—along with emerging perspectives such as ethical leadership, emotional intelligence, and servant leadership. Special emphasis is placed on practical application through case studies, real-world examples, and reflective exercises that encourage critical thinking and managerial decision-making. The book also addresses contemporary challenges such as diversity and inclusion, organizational change, digital transformation, employee engagement, and work-life balance. This text is intended for undergraduate and postgraduate students of Commerce, Management, Business Administration, and related disciplines, as well as aspiring managers and organizational leaders. By integrating theory with practice, it aims to equip readers with the skills required to lead effectively and manage human behavior in diverse organizational settings. In a world where organizations thrive not merely on resources but on people, leadership excellence and behavioral understanding are indispensable. It is my sincere hope that this book will inspire readers to cultivate leadership qualities, enhance interpersonal effectiveness, and contribute positively to organizational success.