The Dutch national COVID-19 metadata portal describes the content of the collections and type of data. The underlying data remains at the source, but where possible a link to the data or the data request procedure are provided on the portal. The first health care data sets in the portal are coming from observational studies funded by ZonMw, NFU COVID-19 clinical research data, collaborating top clinical hospitals (STZ), as well as other regional hospitals. However, the portal is open to any health care provider wishing to make their COVID-19 data available for research.