Dahlgren
- 6945 Dahlgren
- Dahlgren (surname)
- Dahlgren Affair
- Dahlgren Chapel (Maryland)
- Dahlgren Chapel (disambiguation)
- Dahlgren Chapel of the Sacred Heart
- Dahlgren Railroad Heritage Trail
- Dahlgren River
- Dahlgren Township, Carver County, Minnesota
- Dahlgren Township, Hamilton County, Illinois
- Dahlgren gun
- Dahlgren system
- Dahlgren, Illinois
- Dahlgren, Virginia
- Dahlgrens Corner, Virginia
- Dhalgren
- King George County, Virginia
- Lake Dahlgren
- List of Georgetown University buildings
- MetalCraft Marine
- Naval Surface Warfare Center Dahlgren Division
- Noble, Oklahoma
- Rolf Dahlgren
- U.S. Naval Academy