Stigma and discrimination related to mental health conditions are widespread and harmful. Reducing stigma and discrimination can benefit families, societies and economies – it can save lives. The toolkit offers practical guidance on how to achieve this, based on three core evidence-based principles: leadership or co-leadership by people with lived experience, social contact, and inclusive partnerships. These 3 principles can be realized using a four-step process: identify and define aims, plan and prepare, launch and learn and reflect and proceed. Twelve case studies from all across the world are provided to demystify the process. Stigma and discrimination can be ended if each of us acts as one using the principles in this toolkit.