- GovLab
- GrantCraft
- Grantmakers for Effective Organizations (GEO)
- Grantmakers In the Arts
- Grantmakers of Oregon and Southwest Washington
- Grants Managers Network
- Grupo de Institutos Fundações e Empresas (GIFE)
- Guidestar
- Guidestar by Candid
- Hauser Institute For Civil Society at Harvard Kennedy School
- Hispanics in Philanthropy
- Human Rights Funders Network
- Human Rights Funders Network
- IMM, Ltd.
- Independent Development Fund
- Independent Sector
- Indiana Philanthropy Alliance
- Instituto Universitario de Lisboa
- Instituto Walmart
- International Funders for Indigenous Peoples
