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| Representative | Party | District | Years | District home | Note |
|---|---|---|---|---|---|
| Abner Lacock | Democratic-Republican | 11th | March 4, 1811 – March 4, 1813 | ||
| Daniel F. Lafean | Republican | 20th | March 4, 1903 – March 4, 1913 | ||
| At-large | March 4, 1915 – March 4, 1917 | ||||
| John A. Lafore, Jr. | Republican | 13th | November 5, 1957 – January 3, 1961 | ||
| James Landy | Democratic | 3rd | March 4, 1857 – March 4, 1859 | Philadelphia | |
| J. N. Langham | Republican | 27th | March 4, 1909 – March 4, 1915 | ||
| John Laporte | Jacksonian | 17th | March 4, 1833 – March 4, 1837 | ||
| George V. E. Lawrence | Republican | 24th | March 4, 1865 – March 4, 1869 | ||
| March 4, 1883 – March 4, 1885 | |||||
| Joseph Lawrence | Adams | 15th | March 4, 1825 – March 4, 1829 | ||
| Whig | 21st | March 4, 1841 – April 17, 1842 | Died | ||
| Jesse Lazear | Democratic | 20th | March 4, 1861 – March 4, 1863 | ||
| 24th | March 4, 1863 – March 4, 1865 | ||||
| Raymond F. Lederer | Democratic | 3rd | January 3, 1977 – April 29, 1981 | Philadelphia | Resigned |
| Robert E. Lee | Democratic | 12th | March 4, 1911 – March 4, 1915 | Pottsville | |
| J. Russell Leech | Republican | 20th | March 4, 1927 – January 29, 1932 | resigned on appointment as member of US Board of Tax Appeals | |
| Isaac Leet | Democratic | 21st | March 4, 1839 – March 4, 1841 | ||
| Joseph Lefever | Democratic-Republican | 3rd | March 4, 1811 – March 4, 1813 | ||
| William E. Lehman | Democratic | 1st | March 4, 1861 – March 4, 1863 | Philadelphia | |
| Michael Leib | Democratic-Republican | 2nd | March 4, 1799 – March 4, 1803 | Philadelphia | |
| 1st | March 4, 1803 – February 14, 1806 | Resigned | |||
| Owen D. Leib | Democratic | 11th | March 4, 1845 – March 4, 1847 | Catawissa | |
| Paul Leidy | Democratic | 12th | December 7, 1857 – March 4, 1859 | ||
| George G. Leiper | Jacksonian | 4th | March 4, 1829 – March 4, 1831 | ||
| John Leisenring | Republican | 12th | March 4, 1895 – March 4, 1897 | ||
| John T. Lenahan | Democratic | 11th | March 4, 1907 – March 4, 1909 | Wilkes-Barre | |
| Fred C. Leonard | Republican | 16th | March 4, 1895 – March 4, 1897 | ||
| John V. Lesher | Democratic | 16th | March 4, 1913 – March 4, 1921 | Sunbury | |
| Lewis C. Levin | Know Nothing | 1st | March 4, 1845 – March 4, 1851 | Philadelphia | |
| Fred E. Lewis | Republican | At-large | March 4, 1913 – March 4, 1915 | ||
| Robert J. Lewis | Republican | 19th | March 4, 1901 – March 4, 1903 | ||
| Norton L. Lichtenwalner | Democratic | 14th | March 4, 1931 – March 4, 1933 | ||
| Franklin H. Lichtenwalter | Republican | 8th | September 9, 1947 – January 3, 1951 | ||
| Michael Liebel, Jr. | Democratic | 25th | March 4, 1915 – March 4, 1917 | ||
| Mial E. Lilley | Republican | 14th | March 4, 1905 – March 4, 1907 | ||
| William Lilly | Republican | At-large | March 4, 1893 – December 1, 1893 | Died | |
| James F. Lind | Democratic | 21st | January 3, 1949 – January 3, 1953 | ||
| Henry Logan | Jacksonian | 11th | March 4, 1835 – March 4, 1837 | ||
| Democratic | March 4, 1837 – March 4, 1839 | ||||
| J. Washington Logue | Democratic | 6th | March 4, 1913 – March 4, 1915 | ||
| Henry C. Longnecker | Republican | 7th | March 4, 1859 – March 4, 1861 | Allentown | |
| Christian Lower | Democratic-Republican | 3rd | March 4, 1805 – December 19, 1806 | Died | |
| John B. C. Lucas | Democratic-Republican | 11th | March 4, 1803 – ????, 1805 | Resigned before the assembling of the 9th Congress to become district judge of the United States District Court for the District of Louisiana | |
| Aaron Lyle | Democratic-Republican | 10th | March 4, 1809 – March 4, 1813 | ||
| 12th | March 4, 1813 – March 4, 1817 | ||||
| John Lynch | Democratic | 12th | March 4, 1887 – March 4, 1889 |
Read more about this topic: List Of United States Representatives From Pennsylvania