Since its founding the IHJR has received support from a diverse range of public and private funders as well as individual donors. These supporters have included:

Adessium Foundation
Anna Lindh Foundation
Arcadia Trust
Bernheim Foundation
Carnegie Corporation of New York
European Commission
Ford Foundation
Hamburger Institut fur Sozialforschung
Harry Frank Guggenheim Foundation
Heinrich Böll Stiftung
International Bar Association
Dr. Richard and Priscilla Hunt
MacArthur Foundation
Ministry of Foreign Affairs of The Netherlands
The Municipality of The Hague
Robert Bosch Stiftung
Drs. Robert and Marina Whitman Family Foundation
The Sigrid Rausing Trust
The Swiss Federal Department of Foreign Affairs