ONVZ is a non-profit health insurer based in the Netherlands, founded in 1933. Operating as an association ("vereniging"), its primary mission is to serve the interests of its insured members rather than shareholders. The company is known for its focus on providing members with complete freedom to choose their own doctor, specialist, or hospital. ONVZ offers a range of basic and supplementary health insurance policies for individuals, families, and businesses, priding itself on personal service and expert advice.