N
| Senator | Years | State | Party |
|---|---|---|---|
| Arnold Naudain | 1830–1836 | Delaware | National Republican |
| Matthew M. Neely | 1923–1929, 1931–1941, 1949–1958 |
West Virginia | Democratic |
| Arthur E. Nelson | 1942–1943 | Minnesota | Republican |
| Gaylord Nelson | 1963–1981 | Wisconsin | Democratic |
| Knute Nelson | 1895–1923 | Minnesota | Republican |
| James W. Nesmith | 1861–1867 | Oregon | Democratic |
| Maurine Brown Neuberger | 1960–1967 | Oregon | Democratic |
| Richard L. Neuberger | 1955–1960 | Oregon | Democratic |
| Harry S. New | 1917–1923 | Indiana | Republican |
| Truman Handy Newberry | 1919–1922 | Michigan | Republican |
| Francis G. Newlands | 1903–1917 | Nevada | Democratic |
| Robert C. Nicholas | 1836–1841 | Louisiana | Democratic |
| Wilson Cary Nicholas | 1799–1804 | Virginia | Democratic-Republican |
| Alfred O. P. Nicholson | 1840–1842, 1859–1861 |
Tennessee | Democratic |
| Samuel D. Nicholson | 1921–1923 | Colorado | Republican |
| Don Nickles | 1981–2005 | Oklahoma | Republican |
| John Milton Niles | 1835–1839, 1843–1849 |
Connecticut | Democratic |
| George S. Nixon | 1905–1912 | Nevada | Republican |
| Richard M. Nixon | 1950–1953 | California | Republican |
| James Noble | 1816–1831 | Indiana | National Republican |
| Peter Norbeck | 1921–1936 | South Dakota | Republican |
| George William Norris | 1913–1936 | Nebraska | Republican |
| 1936–1943 | Independent | ||
| Moses Norris, Jr. | 1849–1855 | New Hampshire | Democratic |
| William North | 1798 | New York | Federalist |
| Daniel S. Norton | 1865–1870 | Minnesota | Republican |
| John Norvell | 1837–1841 | Michigan | Democratic |
| Thomas M. Norwood | 1871–1877 | Georgia | Democratic |
| Amos Nourse | 1857 | Maine | Republican |
| John F. Nugent | 1918–1921 | Idaho | Democratic |
| Sam Nunn | 1973–1997 | Georgia | Democratic |
| Gerald P. Nye | 1925–1945 | North Dakota | Republican |
| James W. Nye | 1864–1873 | Nevada | Republican |
Read more about this topic: List Of Former United States Senators