Mental health advocacy is a relatively new concept, developed with a view to reducing stigma and discrimination, and promoting the human rights of people with mental disorders. It consists of various actions aimed at changing the major structural and attitudinal barriers to achieving positive mental health outcomes in populations. This module draws attention to the importance of advocacy in mental health policy and service development. The roles of various mental health groups in advocacy are outlined. Practical steps are then recommended, indicating how ministries of health can support advocacy.