Alonzo B. Cook (July 31, 1866 – December 22, 1956) was an American politician who served as Massachusetts Auditor from 1915 to 1931 and was a candidate for Mayor of Boston in 1925 and in 1937; and United States Senator in 1936.

He was born on July 31, 1866, to Levi F. Cook and Eliza Ryan.

One of his brothers, Washington Cook, was also involved in politics.

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