- Ewing Marion Kauffman Foundation
- ExxonMobil Foundation
- FACE
- Fair Trade USA
- FHI 360
- Forum of Regional Associations of Grantmakers
- Foundation Center
- Fourth Quadrant Partners, LLC
- FSG
- Gender Evaluation Methodology
- Giving Evidence
- Global Footprint Network
- Goldman Sachs
- Gordon and Betty Moore Foundation
- Grameen Bank
- Grantmakers for Effective Organizations (GEO)
- Grants Managers Network
- Great Nonprofits
- Greater Rochester Regional Health Foundation
- Guidestar