L
- Laconia (1914)
- Lad's Car (1912–1914)
- LaFayette (1919–1924)
- La Marne (1919–1921)
- Lambert (1906–1917)
- Lancamobile (1900–1901)
- Lane (1900–1911)
- Lanpher (1906–1916)
- Lansden Electric (1901–1903, 1906–1910)
- La Petite (1905)
- Larsen (see Falcon)
- LaSalle (1927–1940)
- La Salle-Niagara (1905–1906)
- Laurel (1916–1920)
- Lauth (1905; Lauth-Juergens 1908-1909)
- La Vigne (1913–1914)
- Lawter (1909)
- LCE (1915–1916)
- L&E (1924–1934)
- Leach (1899–1901)
- Leach(or Leach-Biltwell) (1920–1923)
- Leader (1905–1912)
- Lenawee (1903–1904)
- Lende (1902–1909)
- Lenox (1911–1917)
- Lenox Electric (see Maxim-Goodridge Electric)
- Leon Rubay (1923)
- Lescina (1916)
- Lewis (1914–1916)
- Lewis Motocycle (1895)
- Lexington (1909–1927)
- Liberty (1916–1924)
- Light Steamer (1901–1902)
- Light Six (1914)
- Lincoln (1908–1909)
- Lincoln (1912–1913) (see also Sears Roebuck)
- Lincoln Highway (1914)
- Lindsley (1908–1909)
- Lion (1909–1912)
- Liquid Air (1899–1902)
- Little (1911–1913)
- Little Detroit Speedster (1913–1914)
- Littlemac (1930–1932)
- Little Princess (1913–1914)
- Locke (See Puritan)
- Locomobile (1899–1929)
- Logan (1904–1908)
- Logan (1903–1908)
- Logan (cyclecars; 1914)
- Lone Star (1919–1922)
- Long Distance (1901–1903)
- Longest (1906)
- Loomis (1900–1904)
- Lord Baltimore (1913)
- Lorraine (1907–1908)
- Lorraine (1920–1921)
- Lorraine (1920–1922)
- Los Angeles (1914)
- Lowell-American (1908–1909)
- Lozier (1900–1918)
- L.P.C. (see Lewis)
- Luck Utility (1911–1914)
- LuLu (1914–1915)
- Luverne (1904–1917)
- Luxor (1924–1927)
- Lyman (1904)
- Lyman & Burnham (1903–1905)
- Lyons-Knight (1913–1915)
Read more about this topic: List Of Defunct Automobile Manufacturers Of The United States