Marmaduke Blennerhassett may refer to:

• Sir Marmaduke Charles Henry Joseph Blennerhassett, 6th Baronet (1902–1940) of the Blennerhassett Baronets
• Sir (Marmaduke) Adrian Francis William Blennerhassett, 7th Baronet (1940–2022) of the Blennerhassett Baronets

• Blennerhassett (disambiguation)

Topics referred to by the same term

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