Book excerpt: Work substantially contributes to one's identity. It provides income for an individual and their family and gives the feeling of playing a useful role in society. However, the nature of work is changing rapidly and factors such as the globalization of markets, urbanization and migration, and the advancements in information technology are impacting on the nature of work and the health and mental health of employees. This module outlines the types of mental health problems encountered in the workplace, their causes and impact. Importantly, it provides guidance to workplaces on how to develop and implement a workplace mental health policy and strategies to improve the mental health of employees. Also available: WHO Mental Health Policy and Service Guidance Package--14 modules Other modules included in the package: Improving Access and Use of Psychotropic Medicines Child and Adolescent Mental Health Policies and Plans Mental Health Policy, Plans and Programmes. Updated version Mental Health Context Mental Health Financing Advocacy for Mental Health Quality Improvement for Mental Health Organization of Services for Mental Health Planning and Budgeting to Deliver Services for Mental Health Mental Health Legislation and Human Rights Mental Health Information Systems Human Resources and Training in Mental Health Monitoring and Evaluation of Mental Health Policies and Plans