- 826 National
- Accelerate Brain Cancer Cure
- ACCION International
- ACCION USA Inc.
- Action Without Borders Inc.
- ActionAid International USA
- Adopt-A-Minefield
- Advocacy Project
- African Children's Haven
- African Medical and Research Foundation
- Africare
- Aid to Artisans
- Alternatives for Girls
- Alzheimer's Association
- Amazon Conservation Association
- Amazon Promise
- American Farmland Trust
- American Federation for Aging Research
- American Near East Refugee Aid (ANERA)
- American Prairie Foundation
- American Refugee Committee
- American Society for the Prevention of Cruelty to Animals
- American Society on Aging
- Americans For The Arts Inc
- Amnesty International USA
- Andre Sobel River Of Life Foundation
- AnewAmerica Community Corporation
- Animal Rescue
- Animal Shelters
- Ape Action Africa