Harold Marsh Sewall (January 3, 1860 – October 28, 1924) was an American politician and diplomat.

Sewall was born in Bath, Sagadahoc County, Maine.

His interment was at Oak Grove Cemetery, Bath, Maine.

[1][2] Following the death of George W. Merrill on January 10, 1914, Sewall became the last living person to serve as the United States Minister to Hawaii.

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