L
- Rudolf Laban — choreographer, created labanotation.
- Ferruccio Lamborghini — founder, Lamborghini
- Vincenzo Lancia - founder, Lancia
- Francesco Landini — Landini cadence, might be described in its most characteristic form as a variation on the harmonic progression in which an unstable sixth (usually major) expands to a stable octave.
- Paul Langerhans — Islets of Langerhans, Langerhans cell, Langerhans cell histiocytosis
- Samuel Pierpont Langley — langley a measurement of solar radiation.
- Lev Davidovich Landau — Landau pole, Landau damping
- Chris Langton — Langton's ant
- Bent Larsen — Larsen's Opening
- Ernest Lawrence — lawrencium, chemical element
- Peter Lee — Peterlee, a town in County Durham
- Alfredo di Lelio — Alfredo sauce
- Vladimir Ilyich Lenin — Leninism, Lenin's Testament, for various places see Lenino and List of places named after Lenin
- John Lennard-Jones — Lennard-Jones potential
- Jules Léotard—leotard
- Leudonus — Lothian
- Lars Levi Læstadius — Laestadianism
- Abraham Lincoln — Lincoln Records; ships USS Abraham Lincoln (SSBN-602), USS Abraham Lincoln (CVN-72); Lincoln is a slang term for the United States five dollar bill
- Charles Lindbergh, pilot — Lindbergh Law anti-kidnapping law
- Lisa, sister of Matt Groening, creator of The Simpsons — Lisa Simpson, character in The Simpsons animated TV series
- David Livingstone - Livingstone daisy, Livingstone, Zambia
- Ignacio de la Llave — Veracruz-Llave
- Veronica Lodge, fictional character in Archie Comics - the Veronica search engine
- Fritz London — London force
- Huey Pierce Long, American politician — Huey, one of "Huey, Dewey and Louie", animated cartoon characters
- Ruy López de Segura, Spanish monk — Ruy Lopez opening in chess
- John De Lorean — De Lorean
- Hendrik Lorentz — Lorentz force, Lorentz transformation
- Lothar — Lorraine, French province
- Allan Haines Loughead - Lockheed Corporation later to become Lockheed Martin in 1995
- King Louis XIV of France — Louisiana
- Princess Louise Caroline Alberta, fourth daughter of Queen Victoria — Alberta
- H. P. Lovecraft, Among the most famous horror authors. Inspired the term Lovecraftian.
- Hubert von Luschka — foramina of Luschka (outlets for cerebrospinal fluid in the brain); Luschka's crypts; Luschka's joints
- Saint Lucy of Syracuse — Saint Lucia
- Martin Luther — the Lutheran Christian denomination
- Alois Lutz — Lutz, Figure skating jump
- Charles Lynch — lynching, lynch law
- Trofim Lysenko — Lysenkoism
Read more about this topic: List Of Eponyms (L-Z)