This document summarizes a lecture on positive occupational health and work engagement. The lecture discusses how perspectives on work and occupational health are shifting from a traditional negative focus on disease and damage to a positive focus on thriving and optimal human functioning. It defines work engagement as a positive work-related state characterized by vigor, dedication and absorption. The lecture reviews research showing that approximately 25% of employees are engaged, and engagement is higher in certain professions. Engagement is stable over time and influenced by job resources and personal characteristics. Studies link work engagement to improved business outcomes like performance, safety and profitability.