Nathaniel Bowditch Blunt (c. 1804 in Newburyport, Essex County, Massachusetts – July 17, 1854 in Lebanon Springs, Columbia County, New York) was an American lawyer and politician from New York.
He was the youngest of four sons of Edmund March Blunt. N. B. Blunt was New York County District Attorney from 1851 until his death in July 1854, elected in 1850 and 1853 on the Whig ticket. In 1853, he defeated the Democratic candidate Chauncey Shaffer by a majority of only 78 votes.
In 1851, Blunt appointed as his Assistant D.A. the then 24-year-old A. Oakey Hall who was elected D.A. of New York in November 1854, and was Mayor of New York City from 1869 to 1872.
Nathaniel's oldest brother, Joseph Blunt, was New York County District Attorney in 1858. The other two brothers, Edmund (1799-1866) and George William (1802-1878) followed their father's steps and got involved in nautical affairs. Edmund assisted Ferdinand Rudolph Hassler in surveying the port of New York for the United States Coast Survey in 1817. George William Blunt was for decades a member, and later secretary, of the Board of Pilot Commissioners, and in 1857 was appointed a New York Harbor Commissioner.