ASER Health Report summarises our work over the last few years in extending the ASER approach to the health and nutrition sector. ASER Health aims to provide independent, reliable and action-oriented data for the health and nutrition sector, helping to bridge the existing information gaps and contribute towards the achievement of good health and well-being for all. A rigorous approach was developed iteratively and implemented successfully in district-level surveys in Sambalpur (Odisha) and Udupi (Karnataka) in India. This survey approach is rapid, citizen-led and cost-effective, making it easily scalable.