Work environment, sometimes also called “work climate” or “culture,” has become an important factor in health services research, shown in numerous studies to be associated with positive outcomes for workers, patients, and organizations. However, what do we mean when we say an organization has a good work environment or culture or climate? Does an organization have multiple cultures or work environments, for example, on different units or among different professions? If so, whose work environment matters for understanding what an organization does or how it performs? These questions motivated the current study, which examines the diversity of work environments in hospitals as well as the implications for processes and outcomes for organizations, employees, and patients.