Mental health needs assessments (MHNA) are a fundamental foundation for commissioning and delivering services which truly meet the needs of local communities. Only by understanding the breadth of local needs can services work to meet them. And at a time of rising mental distress, commissioning the most effective support is more essential than ever. Building on a report with Public Health England about best practice for MHNAs, and drawing on examples from around England, this resource sets out the key factors for producing an impactful needs assessment.