Presented for students within the course "Crisis and Disaster Management Training (a)," this lecture on "Ventilation in Road Tunnels" provides a comprehensive examination of key elements essential for maintaining a secure and efficient tunnel environment. The content is structured to cover various facets, with an emphasis on the pivotal role of ventilation in ensuring air quality and safety. It delves into the diverse range of ventilation systems designed for tunnel operation, elucidating their applications, advantages, and technological innovations. The concept of natural ventilation is introduced, underscoring its role in promoting air circulation without relying on mechanical systems. The complexities of mechanical ventilation systems and their contribution to optimal air quality are unveiled. Additionally, the lecture addresses critical aspects such as ventilation management during a fire, examining techniques and strategies to ensure the safety of tunnel users in emergency situations.