- L'Amour, Louis – American novelist of westerns
- L'Engle, Madeleine – American juvenile science fiction novelist
- L'Isle, Adam De
- La Fontaine
- La Grange, Marquis de
- Ladman, Cathy
- Laertius, Diogenes
- Lagemann, John Kord
- Laing, R. D.
- Lair, Jess
- Laki, Harold
- Lamarr, Hedy
- Lamb, Charles – English critic & essayist
- Lamb, Wally
- Lamott, Anne
- Lancaster, Hal
- Landers, Ann – American advice columnist
- Landon, Michael – American actor
- Landor, Walter – English author
- Lang, Andrew – Scottish author & scholar
- Langbridge, Frederick
- Langer, Susanne – American educator & philosopher
- Langland, William – English poet
- Langtry, Lily – British actress
- Lappe, Anna
- Lappe, Frances Moore
- Lardner, Ring – American author
- Larson, Doug
- Lasch, Christopher
- Lauder, Estee
- Lavater, Johann K.
- Lavigne, Avril
- Law, Vernon Sanders
- Lawrence, D.H. – English novelist
- Lawrence, T. E. – British soldier
- Laws of Manu, The
- Lazarus, Mel
- Le Fanu, Joseph Sheridan
- Leach, Reggie
- Leacock, Stephen – Canadian economist & humorist
- Leahy, Frank
- Leahy, Senator Patrick – American Democratic politician
- Leary, Timothy – American psychologist & promoter of mind-altering drugs
- Lebowitz, Fran – American writer and humorist
- Lec, Stanislaw J. – Polish writer
- Lee, Bruce – American martial arts expert & movie actor
- Lee, Gypsy Rose – American actress & stripper
- Lee, Harold B. – American Mormon clergyman
- Lee, Harper – American novelist
- Lee, Robert E. – US-Confederate general
- LeGuin, Ursula K.
- Lehman, John – American administrator
- Lehrer, Tom – American humorist, singer, & songwriter
- Lem, Stanislaw – Polish science fiction author
- Lenclos, Ninon de – French courtesan
- Leneru, Marie
- Lenin – Russian Communist politician & revolutionary
- Lennon, John – English singer & songwriter
- Lennox, Annie
- Leno, Jay – American comedian & television host
- Leonard, Elmore
- Leonidas of Tarentum
- LePatner, Barry
- Lerner, Harriet
- Leroux, Gaston
- Lespinasse, Julie-Jeanne-Eleonore de
- Lessing, Doris
- Lessing, G. E. – German critic & dramatist
- Leszczynski, Stanislaw – elected Polish king 1704-1709, 1733-1734
- Letterman, David – American comedian & television host
- Letterman, Elmer G.
- Levant, Oscar
- Levenson, Sam
- Levertov, Denise
- Levi, Leone
| - Levin, Alex
- Levinson, Leonard Louis
- Lewes, George Henry
- Lewin, Kurt – American (German-born) psychologist
- Lewis, C. S. – English essayist & juvenile novelist
- Lewis, Jane Galvin
- Lewis, Joe E.
- Lewis, Richard
- Lewis, Sinclair – American novelist
- Liberace – American pianist
- Lichtenberg, Georg Christoph
- Lichty and Wagner
- Licretius
- Liddy, G. Gordon
- Lie, Jonas
- Liebling, A. J.
- Lileks, James
- Lille, Alain de
- Lilly, John
- Lincoln, Abraham – 16th president of US
- Lincoln, Mary Todd – American wife of Abraham Lincoln 1842
- Lindbergh, Anne Morrow
- Lindbergh, Charles – American aviator
- Lindquist, Raymond
- Lindsay, S. E.
- Lindsay, Vachel – American poet
- Lindsey, Ben
- Liner, Elaine
- Link, Henry C.
- Linkletter, Art
- Linn-Desmond, Nancy
- Linnaeus – Swedish botanist
- Lipkin, Israel
- Lippmann, Walter – American author & journalist
- Lisle, Holly
- Lithgow, John
- Little, Mary Wilson
- Livingstone, Belle
- Livius, Titus – Roman author & historian
- Lloyd, William
- Lobel, Arnold
- Locke, John – English empiricist philosopher
- Locker-Lampson, Frederick
- Loewy, Raymond
- Lofting, Hugh
- Lohan, Lindsay – American actress
- Lois, George
- Lombardi, Vince – American football coach
- London, Jack – American adventurer, author, & sailor
- Long, Janet
- Longfellow, Henry Wadsworth – American poet
- Longworth, Alice Roosevelt – American author & wit
- Lopate, Phillip
- Lorde, Audre
- Loren, Sophia – American (Italian-born) movie actress
- Lorenz, Konrad – German (Austrian-born) ethologist
- Lorenzoni, Father Larry
- Louden, Jennifer
- Lovecraft, H. P. – American horror & supernatural author
- Lowell, A. Lawrence – American educator & political scientist
- Lowell, Amy – American critic & poet
- Lowell, James Russell – American diplomat, essayist, & poet
- Lowenstein, Allard
- Lucan – Roman epic poet
- Lucas, E. V.
- Lucas, George – American movie director & screenwriter
- Luce, Clare Booth – American diplomat, dramatist, journalist, & politician
- Luckman, Charles
- Lucretius – Roman Epicurean poet, philosopher, & scientist
- Lunden, Joan
- Luther, Martin – German religious reformer
- Lynd, Robert – Irish essayist and nationalist
- Lynes, Russel
- Lyon, Bill
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