| Author (number of quotes) | Description |
| La |
| Lady Gaga (3) | stage name of Stefani Germanotta, American singer and songwriter |
| Laertius, Diogenes (1) | Biographer of the Greek philosophers |
| Lagerfeld, Karl (1) | German fashion designer |
| LaGrange, Joseph-Louis (1) | Italian-born French mathematician and astronomer |
| Lakatos, Imre (1) | Hungarian philosopher of mathematics and science |
| Lamarr, Hedy (1) | Austrian-born American actress and inventor |
| Lamartine, Alphonse de (2) | French author and poet |
| Lamb, Charles (2) | |
| Lamb, Wally (1) | American author |
| Lambert, Adam (2) | American singer, songwriter, and actor |
| Lamont, Corliss (1) | |
| Landers, Ann (2) | |
| Landon, Letitia Elizabeth (1) | |
| Langer, Ellen J. (3) | American psychologist |
| Laplace, Pierre-Simon (1) | French mathematician, astronomer |
| Larson, Doug (10) | English runner |
| Larson, Gary (1) | American cartoonist |
| Larson, Jonathan (1) | American composer and playwright |
| Larsson, Stieg (1) | Swedish author |
| Lasch, Christopher (1) | American historian and moralist |
| Lautner, Taylor (1) | American actor, model, and martial artist |
| Law, Vernon Sanders (1) | |
| Lawrence, Cooper (1) | American radio veteran and author |
| Lawrence, D. H. (8) | full name David Herbert Richards Lawrence, English author, poet, literary critic and painter |
| Lawrence, David Herbert (3) | |
| Lawrence, Elizabeth (1) | |
| Lawrence, Jennifer (1) | American actress |
| Lawrence, Mark (1) | American and British novelist |
| Le |
| Leavitt, Robert Keith (1) | American author |
| Lebowitz, Fran (2) | American author |
| Lec, Stanislaw Jerzy (3) | Polish poet |
| Lederer, Richard (1) | American author, speaker, and teacher |
| Lederman, Leon (1) | American physicist |
| Lee, Bruce (11) | American martial arts instructor and actor |
| Lee, Christopher (2) | English actor |
| Lee, Harper (7) | American author |
| Lee, Stan (1) | pen name of Stanley Martin Lieber, American comic book writer |
| Leguizamo, John (1) | Colombian-born American actor and producer |
| Lehrer, Tom (2) | American singer and mathematician |
| Leigh, Vivien (1) | English actress |
| Leighton, Robert (1) | |
| Lennon, John (10) | English musician and singer-songwriter, one of the founding members of The Beatles |
| Leno, Jay (2) | |
| Leonard, Robert Sean (1) | American actor |
| Lessing, Doris (1) | |
| Leto, Jared (1) | American actor and musician |
| Letterman, Elmer G. (2) | American businessman and author |
| Leunig, Michael (1) | |
| Levant, Oscar (4) | American musician, actor, author |
| Levenson, Sam (3) | American comedian |
| Levenstein, Aaron (1) | American academic |
| Levi-Strauss, Claude (1) | French anthropologist, ethnologist |
| Levine, Adam (1) | American singer and composer |
| Levine, Robert (1) | American psychologist |
| Levine, Stephen (1) | American poet, author |
| Levy, Marvin D. (1) | |
| Lewis, Andrew (1) | Canadian software developer |
| Lewis, C. S. (4) | |
| Lewis, David A. (1) | |
| Lewis, Joseph (1) | American freethinker and activist |
| Lewis, Sinclair (1) | American author |
| Li |
| Liebling, A. J. (1) | American journalist |
| Likert, Rensis (1) | American psychologist |
| Lima, Adriana (2) | Brazilian model and actress |
| Lincoln, Abraham (18) | the 16th President of the United States |
| Lindbergh, Anne Morrow (1) | American pilot |
| Lindner, Robert M. (1) | American author and psychologist |
| Lindqvist, John Ajvide (6) | Swedish author |
| Lindsay, Margaret (1) | American actress |
| Liszt, Ferenc (5) | Hungarian composer and pianist |
| Liu, Lucy (1) | Chinese-born American actress |
| Lively, Blake (1) | American actress |
| Livermore, Jesse Lauriston (1) | American stock trader |
| Livingstone, Ian (1) | English author and entrepreneur |
| Livius, Titus (1) | Roman historian |
| Ll |
| Llosa, Mario Vargas (1) | |
| Lo |
| Locke, John (3) | English philosopher, doctor, politician |
| Lombardi, Vince (3) | American coach |
| London, Jack (3) | American author |
| Long, Haniel Clark (1) | American poet and author |
| Longfellow, Henry Wadsworth (6) | American author and poet |
| Longoria, Eva (1) | American actress |
| Lopez, Jennifer (1) | American singer and actress |
| Lopez, Steve (1) | |
| Loren, Sophia (1) | Italian actress |
| Lorenz, Konrad (3) | Austrian zoologist, ethologist, and ornithologist |
| Lovato, Demi (4) | American actress and singer |
| Lovecraft, H. P. (1) | |
| Lovelace, Richard (1) | English poet |
| Low, George (1) | NASA administrator and 14th President of Rensselaer Polytechnic Institute |
| Lowell, James Russell (1) | |
| Lowry, Lois (1) | American author |
| Lu |
| Lubbock, John (1) | |
| Lucado, Max (2) | American author and preacher |
| Lugosi, Béla (3) | Hungarian-American actor |
| Lukjanenko, Sergey (1) | |
| Luther, Martin (9) | German clegyman |
| Luxemburg, Rosa (1) | German philosopher, economist and social activist |
| Ly |
| Lydiard, Arthur (1) | New Zealand runner and athletics coach |
| Lynes, Russell (1) | American art historian and photographer |