 In 2020, nearly two billion people didn't have regular access to sufficient and nutritious food. Most of these people rely on local food systems, both to access food and to generate an income. Food systems involve people and institutions across various processes, including food production, processing, storage, marketing and consumption. Improving food systems is key to making healthy diets available and accessible to all. However, the complexity of these systems can make it difficult to understand what needs to be done first, what will make the most impact, and measure progress within short time frames. Being the physical places where supply and demand meet, territorial markets are at the core of local food systems and can catalyze their transformation. Developed and tested in partnership with producers organizations, NGOs and research institutes, the methodology for mapping territorial markets is a quick and easy tool that can support the design and implementation of evidence-based policies and interventions. The methodology relies on data collected locally to identify existing gaps and context-based solutions. For instance, having identified the best-performing local markets allows one to easily replicate or adapt the dynamics in other markets in the same country, with the ultimate goal of transitioning towards sustainable food systems. Improving territorial markets has the potential to benefit other aspects of food systems. For example, addressing gaps in markets' infrastructures and business services may benefit not only food retailers, but also food producers and consumers, helping build better markets where business development opportunities increase and consumers can access diverse, safe and nutritious food. The methodology for mapping territorial markets is a tool that can generate reliable and easily accessible information to support territorial development, economic inclusion, and improve the quality of people's diets.