Mental health and substance use problems are experienced by many Australians and research has indicated these problems are far more prevalent in the homeless population. This bulletin, the sixth thematic report from the Supported Accommodation Assistance Program (SAAP) National Data Collection (NDC), shows that a number of SAAP clients have mental health and/or substance use problems and provides an overview of the assistance given to these clients by the Program. SAAP is a major part of Australia's overall response to homelessness and represents a broader social safety net designed to help people in crisis in the community.