| Quoted Person | Number of Quotes |
| L. Ogborn | 1 |
| La Rochefoucald | 1 |
| Lady Barbauld | 2 |
| Lady Mary Wortley Montagu | 2 |
| Lady Mary Wortley Montague | 1 |
| Langston Hughes | 2 |
| Lao-Tzu | 1 |
| Larry Ellison | 1 |
| Larry Wilde | 1 |
| Latin Proverb | 2 |
| Laura Ingalls Wilder | 1 |
| Lauren Bacall | 4 |
| Laurence J. Peter | 2 |
| Laurence Peter | 18 |
| Lawrence Diggs | 1 |
| Lazy Dog | 1 |
| Lee Trevino | 1 |
| Leigh Hunt | 1 |
| Lemuel Washburn | 1 |
| Lenor Hershey | 1 |
| Leo Burke | 1 |
| Leo Durocher | 1 |
| Leo Gallagher | 1 |
| Leo Tolstoy | 3 |
| Leon Trotsky | 1 |
| Leonard Brandwein | 1 |
| Leonardo da Vinci | 12 |
| Lewis Carroll | 2 |
| Lewis Sperry Chafer | 1 |
| Lillian Hellman | 1 |
| Lily Tomlin | 1 |
| Linda Blandford | 1 |
| Lionel Trilling | 1 |
| Lord Chesterfield | 1 |
| Lord Dunsany | 1 |
| Lord Jeffery | 1 |
| Lord John Russell | 1 |
| Louis E. Boone | 1 |
| Louis Hector Berlioz | 1 |
| Louis L'Amour | 1 |
| Louis Pasteur | 1 |
| Louise Brown | 1 |
| Lucan | 1 |
| Lucille Ball | 2 |
| Lucius Annaeus Seneca | 1 |
| Ludwig Wittgenstein | 1 |
| Luther Sutherland | 1 |
| Lyall Watson | 1 |
| Lyndon B. Johnson | 1 |
| Lynn Lavner | 1 |