John Blennerhassett
John Blennerhassett may refer to:
- John Blennerhassett (landowner), English MP
- John Blennerhassett (judge), English judge
- John Blennerhassett (died 1677), Anglo-Irish MP for Tralee
- John Blennerhassett (died 1709), Anglo-Irish MP for Tralee, Dingle and County Kerry
- John Blennerhassett (1691–1775), Anglo-Irish MP for County Kerry and Tralee
- John Blennerhassett (1715–1763), Anglo-Irish MP for Kerry
- John Blennerhassett (1769–1794), Anglo-Irish MP for Kerry
- John Blennerhassett (1930–2013), Irish Fine Gael politician