L
| Senator | Years | State | Party |
|---|---|---|---|
| Robert M. La Follette, Jr. | 1925–1934 | Wisconsin | Republican |
| 1934–1947 | Progressive | ||
| Robert M. La Follette, Sr. | 1905–1925 | Wisconsin | Republican |
| Abner Lacock | 1813–1819 | Pennsylvania | Democratic-Republican |
| Edwin F. Ladd | 1921–1925 | North Dakota | Republican |
| William R. Laird, III | 1956 | West Virginia | Democratic |
| Lucius Q. C. Lamar | 1877–1885 | Mississippi | Democratic |
| John Lambert | 1809–1815 | New Jersey | Democratic-Republican |
| Harry Lane | 1913–1917 | Oregon | Democratic |
| Henry Smith Lane | 1861–1867 | Indiana | Republican |
| James H. Lane | 1861–1866 | Kansas | Republican |
| Joseph Lane | 1859–1861 | Oregon | Democratic |
| John Langdon | 1789–1793 | New Hampshire | Federalist |
| 1793–1801 | Democratic-Republican | ||
| William Langer | 1941–1959 | North Dakota | Republican |
| James Lanman | 1819–1825 | Connecticut | Democratic-Republican |
| Elbridge G. Lapham | 1881–1885 | New York | Republican |
| Octaviano A. Larrazolo | 1928–1929 | New Mexico | Republican |
| Milton Latham | 1860–1863 | California | Democratic |
| Asbury Latimer | 1903–1908 | South Carolina | Democratic |
| Henry Latimer | 1795–1801 | Delaware | Federalist |
| John Laurance | 1796–1800 | New York | Federalist |
| Frank J. Lausche | 1957–1969 | Ohio | Democratic |
| Paul Laxalt | 1975–1987 | Nevada | Republican |
| Luke Lea | 1911–1917 | Tennessee | Democratic |
| Edward L. Leahy | 1949–1950 | Rhode Island | Democratic |
| Walter Leake | 1817–1820 | Mississippi | Democratic-Republican |
| Blair Lee I | 1914–1917 | Maryland | Democratic |
| Joshua B. Lee | 1937–1943 | Oklahoma | Democratic |
| Richard Henry Lee | 1789–1792 | Virginia | Democratic-Republican |
| Herbert H. Lehman | 1949–1957 | New York | Democratic |
| Michael Leib | 1809–1814 | Pennsylvania | Democratic-Republican |
| Benjamin W. Leigh | 1834–1836 | Virginia | National Republican |
| George LeMieux | 2009–2011 | Florida | Republican |
| Alton Asa Lennon | 1953–1954 | North Carolina | Democratic |
| Irvine Lenroot | 1918–1927 | Wisconsin | Republican |
| Dixon Hall Lewis | 1844–1848 | Alabama | Democratic |
| J. Hamilton Lewis | 1913–1919, 1931–1939 |
Illinois | Democratic |
| John F. Lewis | 1870–1875 | Virginia | Republican |
| Blanche Lincoln | 1999–2011 | Arkansas | Democratic |
| William Lindsay | 1893–1901 | Kentucky | Democratic |
| Lewis F. Linn | 1833–1843 | Missouri | Democratic |
| Henry F. Lippitt | 1911–1917 | Rhode Island | Republican |
| Samuel Livermore | 1793–1801 | New Hampshire | Federalist |
| Edward Livingston | 1829–1831 | Louisiana | Democratic |
| Edward Lloyd | 1819–1824 | Maryland | Democratic-Republican |
| 1824–1826 | Democratic | ||
| James Lloyd of Maryland | 1797–1800 | Maryland | Federalist |
| James Lloyd of Massachusetts | 1808–1813, 1822–1824 |
Massachusetts | Federalist |
| 1824–1826 | National Republican | ||
| Cyrus Locher | 1928 | Ohio | Democratic |
| Francis Locke | 1814–1815 | North Carolina | Democratic-Republican |
| Henry Cabot Lodge | 1893–1924 | Massachusetts | Republican |
| Henry Cabot Lodge, Jr. | 1937–1944, 1947–1953 |
Massachusetts | Republican |
| Scott Loftin | 1936 | Florida | Democratic |
| George Logan | 1801–1807 | Pennsylvania | Democratic-Republican |
| John A. Logan | 1871–1877, 1879–1886 |
Illinois | Republican |
| M. M. Logan | 1931–1939 | Kentucky | Democratic |
| William Logan | 1819–1820 | Kentucky | Democratic-Republican |
| Augustine Lonergan | 1933–1939 | Connecticut | Democratic |
| Chester I. Long | 1903–1909 | Kansas | Republican |
| Edward V. Long | 1960–1968 | Missouri | Democratic |
| Huey P. Long | 1932–1935 | Louisiana | Democratic |
| Oren E. Long | 1959–1963 | Hawaii | Democratic |
| Rose McConnell Long | 1936–1937 | Louisiana | Democratic |
| Russell B. Long | 1948–1987 | Louisiana | Democratic |
| William Lorimer | 1909–1912 | Illinois | Republican |
| Trent Lott | 1989–2007 | Mississippi | Republican |
| Walter Lowrie | 1819–1825 | Pennsylvania | Democratic-Republican |
| Daniel B. Lucas | 1887 | West Virginia | Democratic |
| Scott W. Lucas | 1939–1951 | Illinois | Democratic |
| Alva M. Lumpkin | 1941 | South Carolina | Democratic |
| Wilson Lumpkin | 1837–1841 | Georgia | Democratic |
| Ernest Lundeen | 1937–1940 | Minnesota | Farmer-Laborite |
| Hall S. Lusk | 1960 | Oregon | Democratic |
| Lucius Lyon | 1837–1839 | Michigan | Democratic |
Read more about this topic: List Of Former United States Senators