This chapter explores the interconnectedness of culture, values, and leadership within police organizations. It emphasizes the importance of understanding both organizational culture and the unique subcultures of policing to enhance leadership effectiveness. The chapter outlines how culture is formed, sustained, and challenged within institutions, particularly in law enforcement. It analyzes police culture as a collective mental programming shaped by professional experiences, national values, and operational demands. The complexity of police subcultures, the relationship between leadership and culture, and the challenges of cultural change are discussed. The chapter concludes that culture-aware leadership is essential for positive development and ethical performance in policing.