Nehemiah Day Sperry (July 10, 1827 - November 13, 1911) was a U.S. Representative from Connecticut.
Born in Woodbridge, Connecticut, Sperry attended the common schools and a private school in New Haven. He engaged in agricultural pursuits and worked in a mill. He taught school for several years. He became a member of a building and contracting firm. He served as member of the common council in 1853, and Alderman of the city in 1854. He served as Secretary of the State of Connecticut in 1855 and 1856. He served as delegate to the Republican National Conventions in 1856, 1864, and 1888. He served as member and secretary of the national and executive committees. He served as chairman of the Republican State committee for a number of years. He served as chairman of the recruiting committee of New Haven during the Civil War. He was appointed July 16, 1861, by President Lincoln as postmaster of New Haven, and then reappointed and served until removed by President Cleveland January 20, 1886. He was again made postmaster at New Haven and served from January 9, 1890, until March 15, 1894.
Sperry was elected as a Republican to the Fifty-fourth and to the seven succeeding Congresses (March 4, 1895-March 3, 1911). He served as chairman of the Committee on Alcohol Liquor Traffic (Fifty-sixth through Sixty-first Congresses). He was not a candidate for renomination in 1910. He died in New Haven, Connecticut, on November 13, 1911. He was interred in Evergreen Cemetery.