Blennerhassett may refer to:
- Harman Blennerhassett, Anglo-Irish aristocrat
- Blennerhassett, West Virginia, USA
- Blennerhassett Island, West Virginia, USA
- Blennerhassett Island Historical State Park
- Blennerhassett Island Bridge
- Blennerhassett (opera)
Read more about Blennerhassett: Surname