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|  | Fernandez, Teresa Leger | D | NM | U.S. House | 2021 – 2025 |
| | La Follette, Charles Marion | R | IN | U.S. House | 1943 – 1947 |
| | La Follette, Robert Marion | PROG | WI | U.S. Senate | 1925 – 1947 |
| | Labrador, Raúl R. | R | ID | U.S. House | 2011 – 2019 |
| | LaFalce, John Joseph | D | NY | U.S. House | 1975 – 2003 |
| | Lafore, John Armand, Jr. | R | PA | U.S. House | 1958 – 1961 |
| | Lagomarsino, Robert John | R | CA | U.S. House | 1974 – 1993 |
| | LaHood, Darin | R | IL | U.S. House | 2015 – 2025 |
| | LaHood, Ray | R | IL | U.S. House | 1995 – 2009 |
| | Laird, Melvin Robert | R | WI | U.S. House | 1953 – 1969 |
| | Laird, William Ramsey, III | D | WV | U.S. Senate | 1956 – 1956 |
| | LaLota, Nick | R | NY | U.S. House | 2023 – 2025 |
| | LaMalfa, Doug | R | CA | U.S. House | 2013 – 2025 |
| | Lamb, Conor | D | PA | U.S. House | 2018 – 2023 |
| | Lamborn, Doug | R | CO | U.S. House | 2007 – 2025 |
| | Lampson, Nick | D | TX | U.S. House | 1997 – 2009 |
| | Lancaster, H. Martin | D | NC | U.S. House | 1987 – 1995 |
| | Lance, Leonard | R | NJ | U.S. House | 2009 – 2019 |
| | Landgrebe, Earl Fredrick | R | IN | U.S. House | 1969 – 1975 |
| | Landis, Gerald Wayne | R | IN | U.S. House | 1945 – 1949 |
| | Landrieu, Mary L. | D | LA | U.S. Senate | 1997 – 2015 |
| | Landrum, Phillip Mitchell | D | GA | U.S. House | 1953 – 1977 |
| | Landry, Jeff | R | LA | U.S. House | 2011 – 2013 |
| | Landsman, Greg | D | OH | U.S. House | 2023 – 2025 |
| | Lane, Thomas Joseph | D | MA | U.S. House | 1945 – 1963 |
| | Langen, Odin Elsford Stanley | R | MN | U.S. House | 1959 – 1971 |
| | Langer, William | R | ND | U.S. Senate | 1945 – 1959 |
| | Langevin, Jim | D | RI | U.S. House | 2001 – 2023 |
| | Langworthy, Nick | R | NY | U.S. House | 2023 – 2025 |
| | Lanham, Fritz Garland | D | TX | U.S. House | 1945 – 1947 |
| | Lanham, Henderson Lovelace | D | GA | U.S. House | 1947 – 1957 |
| | Lankford, James | R | OK | U.S. Senate | 2011 – 2029 |
| | Lankford, Richard Estep | D | MD | U.S. House | 1955 – 1965 |
| | Lantaff, William Courtland | D | FL | U.S. House | 1951 – 1955 |
| | Lantos, Tom | D | CA | U.S. House | 1981 – 2008 |
| | Larcade, Henry Dominique, Jr. | D | LA | U.S. House | 1945 – 1953 |
| | Largent, Steve | R | OK | U.S. House | 1994 – 2002 |
| | Larocco, Larry | D | ID | U.S. House | 1991 – 1995 |
| | Larsen, Rick | D | WA | U.S. House | 2001 – 2025 |
| | Larson, John | D | CT | U.S. House | 1999 – 2025 |
| | Latham, Henry Jepson | R | NY | U.S. House | 1945 – 1958 |
| | Latham, Tom | R | IA | U.S. House | 1995 – 2015 |
| | LaTourette, Steven C. | R | OH | U.S. House | 1995 – 2013 |
| | Latta, Bob | R | OH | U.S. House | 2007 – 2025 |
| | Latta, Delbert Leroy | R | OH | U.S. House | 1959 – 1989 |
| | LaTurner, Jake | R | KS | U.S. House | 2021 – 2025 |
| | Laughlin, Gregory H. | D | TX | U.S. House | 1989 – 1997 |
| | Lausche, Frank John | D | OH | U.S. Senate | 1957 – 1969 |
| | Lautenberg, Frank R. | D | NJ | U.S. Senate | 1983 – 2013 |
| | Lawler, Mike | R | NY | U.S. House | 2023 – 2025 |
| | Lawrence, Brenda | D | MI | U.S. House | 2015 – 2023 |
| | Lawson, Al | D | FL | U.S. House | 2017 – 2023 |
| | Laxalt, Paul Dominque | R | NV | U.S. Senate | 1974 – 1987 |
| | Lazio, Rick A. | R | NY | U.S. House | 1993 – 2001 |
| | Le Compte, Karl Miles | R | IA | U.S. House | 1945 – 1959 |
| | Le Fevre, Jay | R | NY | U.S. House | 1943 – 1952 |
| | Lea, Clarence Frederick | D | CA | U.S. House | 1945 – 1949 |
| | Leach, Anthony Claude, Jr. | D | LA | U.S. House | 1979 – 1981 |
| | Leach, Jim | R | IA | U.S. House | 1977 – 2007 |
| | Leahy, Edward Laurence | D | RI | U.S. Senate | 1949 – 1950 |
| | Leahy, Patrick | D | VT | U.S. Senate | 1975 – 2023 |
| | Leath, James Marvin | D | TX | U.S. House | 1979 – 1991 |
| | Leboutillier, John | R | NY | U.S. House | 1981 – 1983 |
| | Lederer, Raymond Francis | D | PA | U.S. House | 1977 – 1981 |
| | Lee, Barbara | D | CA | U.S. House | 1998 – 2025 |
| | Lee, Christopher | R | NY | U.S. House | 2009 – 2011 |
| | Lee, Gary Alcide | R | NY | U.S. House | 1979 – 1983 |
| | Lee, Laurel | R | FL | U.S. House | 2023 – 2025 |
| | Lee, Mike | R | UT | U.S. Senate | 2011 – 2029 |
| | Lee, Summer | D | PA | U.S. House | 2023 – 2025 |
| | Lee, Susie | D | NV | U.S. House | 2019 – 2025 |
| | Lefante, Joseph Anthony | D | NJ | U.S. House | 1977 – 1979 |
| | Leggett, Robert Louis | D | CA | U.S. House | 1963 – 1979 |
| | Lehman, Herbert Henry | D-Lib | NY | U.S. Senate | 1949 – 1957 |
| | Lehman, Richard Henry | D | CA | U.S. House | 1983 – 1995 |
| | Lehman, William | D | FL | U.S. House | 1973 – 1993 |
| | Leland, George Thomas (Mickey) | D | TX | U.S. House | 1979 – 1989 |
| | LeMieux, George | R | FL | U.S. Senate | 2009 – 2011 |
| | Lemke, William | R | ND | U.S. House | 1933 – 1950 |
| | Lennon, Alton Asa | D | NC | U.S. House | 1953 – 1973 |
| | Lent, Norman Frederick | R | NY | U.S. House | 1971 – 1993 |
| | Lesinski, John, Jr. | D | MI | U.S. House | 1951 – 1965 |
| | Lesinski, John | D | MI | U.S. House | 1933 – 1950 |
| | Lesko, Debbie | R | AZ | U.S. House | 2018 – 2025 |
| | Letlow, Letlow | R | LA | U.S. House | 2021 – 2025 |
| | Levering, Robert Woodrow | D | OH | U.S. House | 1959 – 1961 |
| | Levin, Andy | D | MI | U.S. House | 2019 – 2023 |
| | Levin, Mike | D | CA | U.S. House | 2019 – 2025 |
| | Levin, Sander M. | D | MI | U.S. House | 1983 – 2019 |
| | Levine, Meldon Edises | D | CA | U.S. House | 1983 – 1993 |
| | Levitas, Elliott Harris | D | GA | U.S. House | 1975 – 1985 |
| | Levy, David A. | R | NY | U.S. House | 1993 – 1995 |
| | Lewis, Earl Ramage | R | OH | U.S. House | 1945 – 1949 |
| | Lewis, Jason | R | MN | U.S. House | 2017 – 2019 |
| | Lewis, Jerry | R | CA | U.S. House | 1979 – 2013 |
| | Lewis, John | D | GA | U.S. House | 1987 – 2020 |
| | Lewis, Ron | R | KY | U.S. House | 1994 – 2009 |
| | Lewis, Thomas F. | R | FL | U.S. House | 1983 – 1995 |
| | Lewis, William | R | KY | U.S. House | 1948 – 1949 |
| | Libonati, Roland Victor | D | IL | U.S. House | 1958 – 1965 |
| | Lichtenwalter, Franklin Herbert | R | PA | U.S. House | 1947 – 1951 |
| | Lieberman, Joseph I. | I | CT | U.S. Senate | 1989 – 2013 |
| | Lieu, Ted | D | CA | U.S. House | 2015 – 2025 |
| | Lightfoot, James Ross | R | IA | U.S. House | 1985 – 1997 |
| | Lincoln, Blanche | D | AR | U.S. Senate | 1993 – 2011 |
| | Lind, James Francis | D | PA | U.S. House | 1949 – 1953 |
| | Linder, John | R | GA | U.S. House | 1993 – 2011 |
| | Lindsay, John Vliet | R | NY | U.S. House | 1959 – 1965 |
| | Linehan, Neil Joseph | D | IL | U.S. House | 1949 – 1952 |
| | Link, Arthur Albert | D | ND | U.S. House | 1971 – 1973 |
| | Link, William Walter | D | IL | U.S. House | 1945 – 1947 |
| | Lipinski, Daniel | D | IL | U.S. House | 2005 – 2021 |
| | Lipinski, William O. | D | IL | U.S. House | 1983 – 2005 |
| | Lipscomb, Glenard Paul | R | CA | U.S. House | 1953 – 1970 |
| | Litton, Jerry Lon | D | MO | U.S. House | 1973 – 1977 |
| | Livingston, Robert L., Jr. | R | LA | U.S. House | 1977 – 1999 |
| | Lloyd, James Fredrick | D | CA | U.S. House | 1975 – 1981 |
| | Lloyd, Marilyn Laird | D | TN | U.S. House | 1975 – 1995 |
| | Lloyd, Sherman Parkinson | R | UT | U.S. House | 1963 – 1973 |
| | LoBiondo, Frank A. | R | NJ | U.S. House | 1995 – 2019 |
| | Lodge, Henry Cabot, Jr. | R | MA | U.S. Senate | 1947 – 1953 |
| | Lodge, John Davis | R | CT | U.S. House | 1947 – 1952 |
| | Loebsack, Dave | D | IA | U.S. House | 2007 – 2021 |
| | Loeffler, Kelly | R | GA | U.S. Senate | 2020 – 2021 |
| | Loeffler, Thomas Gilbert | R | TX | U.S. House | 1979 – 1987 |
| | Lofgren, Zoe | D | CA | U.S. House | 1995 – 2025 |
| | Long (Thompson), Jill Lynette | D | IN | U.S. House | 1989 – 1995 |
| | Long, Billy | R | MO | U.S. House | 2011 – 2023 |
| | Long, Catherine Small | D | LA | U.S. House | 1985 – 1987 |
| | Long, Clarence Dickinson | D | MD | U.S. House | 1963 – 1985 |
| | Long, Edward Vaughn | D | MO | U.S. Senate | 1960 – 1968 |
| | Long, George Shannon | D | LA | U.S. House | 1953 – 1958 |
| | Long, Gillis William | D | LA | U.S. House | 1963 – 1985 |
| | Long, Oren Ethelbirt | D | HI | U.S. Senate | 1959 – 1963 |
| | Long, Russell Billiu | D | LA | U.S. Senate | 1948 – 1987 |
| | Long, Speedy Oteria | D | LA | U.S. House | 1965 – 1973 |
| | Longley, James | R | ME | U.S. House | 1995 – 1997 |
| | Lopez, Greg | R | CO | U.S. House | 2024 – 2025 |
| | Loser, Joseph Carlton | D | TN | U.S. House | 1957 – 1963 |
| | Lott, Trent | R | MS | U.S. Senate | 1973 – 2007 |
| | Loudermilk, Barry | R | GA | U.S. House | 2015 – 2025 |
| | Love, Francis Johnson | R | WV | U.S. House | 1947 – 1949 |
| | Love, Mia | R | UT | U.S. House | 2015 – 2019 |
| | Love, Rodney Marvin | D | OH | U.S. House | 1965 – 1967 |
| | Lovre, Harold Orrin | R | SD | U.S. House | 1949 – 1957 |
| | Lowenstein, Allard Kenneth | D | NY | U.S. House | 1969 – 1972 |
| | Lowenthal, Alan | D | CA | U.S. House | 2013 – 2023 |
| | Lowery, William David | R | CA | U.S. House | 1981 – 1993 |
| | Lowey, Nita M. | D | NY | U.S. House | 1989 – 2021 |
| | Lowry, Michael Edward | D | WA | U.S. House | 1979 – 1989 |
| | Lucas, Frank | R | OK | U.S. House | 1994 – 2025 |
| | Lucas, Scott Wike | D | IL | U.S. Senate | 1939 – 1951 |
| | Lucas, Wingate Hezekiah | D | TX | U.S. House | 1947 – 1955 |
| | Luce, Clare Boothe | R | CT | U.S. House | 1945 – 1947 |
| | Ludlow, Louis Leon | D | IN | U.S. House | 1945 – 1949 |
| | Luetkemeyer, Blaine | R | MO | U.S. House | 2009 – 2025 |
| | Lugar, Richard G. | R | IN | U.S. Senate | 1977 – 2013 |
| | Lujan, Ben Ray | D | NM | U.S. Senate | 2009 – 2027 |
| | Lujan, Manuel, Jr. | R | NM | U.S. House | 1969 – 1989 |
| | Luken, Charles J. | D | OH | U.S. House | 1991 – 1993 |
| | Luken, Thomas Andrew | D | OH | U.S. House | 1974 – 1991 |
| | Lukens, Donald Edgar | R | OH | U.S. House | 1967 – 1991 |
| | Lummis, Cynthia | R | WY | U.S. Senate | 2009 – 2027 |
| | Luna, Anna Paulina | R | FL | U.S. House | 2023 – 2025 |
| | Lundine, Stanley Nelson | D | NY | U.S. House | 1976 – 1987 |
| | Lungren, Dan | R | CA | U.S. House | 1979 – 2013 |
| | Luria, Elaine | D | VA | U.S. House | 2019 – 2023 |
| | Lusk, Georgia Lee | D | NM | U.S. House | 1947 – 1949 |
| | Lusk, Hall Stoner | D | OR | U.S. Senate | 1960 – 1960 |
| | Luther, William P. | D | MN | U.S. House | 1995 – 2003 |
| | Luttrell, Morgan | R | TX | U.S. House | 2023 – 2025 |
| | Lyle, John Emmett, Jr. | D | TX | U.S. House | 1945 – 1955 |
| | Lynch, Stephen | D | MA | U.S. House | 2001 – 2025 |
| | Lynch, Walter Aloysius | D | NY | U.S. House | 1940 – 1952 |