This article focuses on non-departmental public bodies (NDPBs) in the Netherlands that are funded by public money and whose task is defined by law. In terms of public spending, the service delivery role of NDPBs is quite extensive, and they are investing in new ways of enhancing their efficiency, the quality of their services, and the confidence of those with whom they deal. The notion of broad public accountability applies: NDPBs are not only accountable to the responsible minister and to Parliament (vertical accountability) but to a wider range of stakeholders within civil society (social accountability, customer accountability). Internal accountability (supervisory boards) also has a role to play. The interrelationships are explored and various instruments are described, including performance contracts, annual reports, the role of ministers, and international social reporting standards.