- Dorilton Capital Advisors
- Dougy Center for Grieving Children
- Doulagivers International
- Dover Health
- Doxy.me
- Dreamcatchers
- DrFirst
- Drugs Over Dinner
- Duke Energy
- Duke Global Health Institute
- Duke HomeCare & Hospice
- Duke HomeCare and Hospice
- Duke University
- Duke University Health System
- Duke University Margolis Center for Health Policy
- Duke University School of Medicine
- Duke-National University of Singapore Medical School
- Dun & Bradstreet
- DUOS
- Dupont Hospital