The voluntary sector is widely acknowledged as containing very large numbers of organisations that make an enormous contribution to well-being and social cohesion in the UK. It encompasses charities, social enterprises, mutuals, cooperatives, and many less formal voluntary and community organisations. We know a great deal from survey data about patterns of individual giving to charities, and about patterns of volunteering. But there is a substantial gap in the availability of high-quality data about voluntary organisations. And it is argued that better-quality information and evidence would lead to the contribution of those organisations being properly recognised, leading in turn to higher levels of public and voluntary support for them.