| Fiction work(s) | Film adaptation(s) |
| L.A. Confidential (1990), James Ellroy |
L.A. Confidential (1997) |
| Lad, A Dog (1919), Albert Payson Terhune |
Lad, A Dog (1963) |
| Lady Audley's Secret (1862), Mary Elizabeth Braddon |
Lady Audley's Secret (1912) |
| Lady Audley's Secret (a. k. a. Secrets of Society) (1915) |
| Lady Audley's Secret (1920) |
| Lady Audley's Secret (2000) |
| The Lady in Cement (1961), Marvin H. Albert |
Lady in Cement (1968) |
| Lady L (1958), Romain Gary |
Lady L (1965) |
| The Lady of the Camellias (French: La Dame aux Camélias) (1848), Alexandre Dumas, fils |
Camille (1909) |
| The Lady of the Camellias (1912) |
| The Lady of the Camellias (1915; made by Baldassarre Negroni) |
| The Lady of the Camellias (1915; made by Gustavo Serena) |
| Camille (1915) |
| Camille (1917) |
| Prima Vera (German: Die Kameliendame) (1917) |
| The Red Peacock (German: Arme Violetta) (1920) |
| Camille (1921) |
| The Lady of the Camellias (Swedish: Damen med kameliorna) (1925) |
| Camille (1926; made by Norma Talmadge) |
| Camille (1926; made by Ralph Barton, and starring Charlie Chaplin) |
| The Lady of the Camellias (1934) |
| Camille (1936) |
| The Lady of the Camellias (Italian: La signora dalle camelie) (1947) |
| Traviata '53 (1953) |
| The Lady of the Camellias (1953) |
| Camelia (1954) |
| Camille 2000 (1969) |
| The Lady of the Camellias (1981) |
| Camille (1984)[N 4] |
| The Lady of the Camellias (Polish: Dama kameliowa) (1994) |
| The Lair of the White Worm (1911), Bram Stoker |
The Lair of the White Worm (1988) |
| La lampe dans la fenêtre (1972), Pauline Cadieux |
Cordélia (1980) |
| The Land That Time Forgot (1918), Edgar Rice Burroughs |
The Land That Time Forgot (1975) |
| The People That Time Forgot (1977)[N 5] |
| The Land That Time Forgot (2009) |
| The Land That Time Forgot (2025) |
| The Lands of Risk (Portuguese: As Terras Do Risco) (1994), Agustina Bessa-Luís |
The Convent (1995) |
| Lassie Come-Home (1940), Eric Knight |
Lassie Come Home (1943) |
| Son of Lassie (1945) |
| Courage of Lassie (1946) |
| Hills of Home (1948) |
| The Sun Comes Up (1949) |
| Challenge to Lassie (1950) |
| The Painted Hills (1951) |
| Lassie's Great Adventure (1963) |
| Lassie and the Spirit of Thunder Mountain (1972)[N 4] |
| The Magic of Lassie (1978) |
| Lassie: The New Beginning (1978)[N 4] |
| Lassie (1994) |
| Lassie (2005) |
| Lassie Come Home (2020) |
| Lassie: A New Adventure (German: Lassie – Ein neues Abenteuer) (2023) |
| The Last Days of Pompeii (1834), Edward Bulwer-Lytton |
The Last Days of Pompeii (Italian: Gli ultimi giorni di Pompei) (1913) |
| Jone or the Last Days of Pompeii (Italian: Ione o gli ultimi giorni di Pompei) (1913) |
| The Last Days of Pompeii (1926) |
| The Last Days of Pompeii (1935) |
| The Last Days of Pompeii (French: Les Derniers Jours de Pompéi) (1950) |
| The Last Days of Pompeii (1959) |
| The Last Detail (1970), Darryl Ponicsan |
The Last Detail (1973) |
| The Last Hunt (1954), Milton Lott |
The Last Hunt (1956) |
| Last of the Curlews (1954), Fred Bodsworth |
Last of the Curlews (1972)[N 4] |
| The Last of the Duanes (written 1913, published 1996), Zane Grey |
The Last of the Duanes (1919) |
| The Last of the Duanes (1924) |
| The Last of the Duanes (1930) |
| El último de los Vargas (1930) |
| Last of the Duanes (1941) |
| The Last of the Mohicans (1826), James Fenimore Cooper |
The Last of the Mohicans (1911) |
| The Last of the Mohicans (1920; American) |
| The Last of the Mohicans (German: Der Letzte der Mohikaner) (1920; Germany) |
| The Last of the Mohicans (1932)[N 6] |
| The Last of the Mohicans (1936) |
| Last of the Redskins (1947) |
| The Iroquois Trail (1950) |
| Fall of the Mohicans (Spanish: Uncas, el fin de una raza, Italian: L'ultimo dei Mohicani) (1965) |
| The Last Tomahawk (German: Der letzte Mohikaner) (1965) |
| The Last of the Mohicans (Romanian: Ultimul mohican) (1968)[N 4] |
| Last of the Mohicans (1977)[N 4] |
| The Last of the Mohicans (1987)[N 4] |
| The Last of the Mohicans (1992) |
| The Last Picture Show (1966), Larry McMurtry |
The Last Picture Show (1971) |
| The Last Ride (1996), Thomas Eidson |
The Missing (2003) |
| The Last Song (2009), Nicholas Sparks |
The Last Song (2010) |
| Last Stand at Papago Wells (1957), Louis L'Amour |
Apache Territory (1958) |
| Last Stand at Saber River (1959), Elmore Leonard |
Last Stand at Saber River (1997) |
| The Last Thing He Wanted (1996), Joan Didion |
The Last Thing He Wanted (2020) |
| The Last Unicorn (1968), Peter S. Beagle |
The Last Unicorn (1982) |
| The Late George Apley (1937), John P. Marquand |
The Late George Apley (1947) |
| The Laughing Cavalier (1913), Baroness Orczy |
The Laughing Cavalier (1917) |
| Laura (serialised 1942, published as a book 1943), Vera Caspary |
Laura (1944) |
| Laura (1968)[N 4] |
| Law and Order (1973), Dorothy Uhnak |
Law and Order (1976)[N 4] |
| The Law at Randado (1954), Elmore Leonard |
Border Shootout (1990) |
| Law Man (1955), Lauran Paine |
The Quiet Gun (1957) |
| Lawyer Man (1932), Max Trell |
Lawyer Man (1933) |
| Lay This Laurel (1973), Lincoln Kirstein |
Glory (1989) |
| Layer Cake (2000), J. J. Connolly |
Layer Cake (2004) |
| Leaving Cheyenne (1963), Larry McMurtry |
Lovin' Molly (1974) |
| The Ledger (1970), Dorothy Uhnak |
Get Christie Love! (1974)[N 4] |
| Left Behind (1995–2007) (series), Tim LaHaye and Jerry B. Jenkins |
Left Behind: The Movie (2000)[N 7][N 8] |
| Left Behind II: Tribulation Force (2002)[N 7][N 8] |
| Left Behind: World at War (2005)[N 7][N 8] |
| Left Behind (2014)[N 8] |
| Vanished – Left Behind: Next Generation (2016)[N 9][N 8] |
| Left Behind: Rise of the Antichrist (2023)[N 10][N 8] |
| The Legend of the Condor Heroes (Chinese: 射鵰英雄傳, Shè Diāo Yīng Xióng Zhuàn) (1957–1959), Jin Yong |
Story of the Vulture Conqueror (Chinese: 射鵰英雄傳) (1958–1959) |
| The Brave Archer (1977) |
| The Brave Archer 2 (1978) |
| The Brave Archer 3 (1981) |
| The Brave Archer and His Mate (1982) |
| The Eagle Shooting Heroes (Chinese: 射鵰英雄傳之東成西就, Se diu ying hung ji dung sing sai jau) (1993) |
| Ashes of Time (Chinese: 東邪西毒, Dongxié Xidú) (1994) |
| Legend of the Galactic Heroes (Japanese: 銀河英雄伝説, Hepburn: Ginga Eiyū Densetsu) (1982–1987), Yoshiki Tanaka |
Legend of the Galactic Heroes: My Conquest is the Sea of Stars (1988) |
| Legend of the Galactic Heroes: Golden Wings (1992) |
| Legend of the Galactic Heroes: Overture to a New War (1993) |
| Legend of the Galactic Heroes: Die Neue These - Stellar War (2019) |
| Legend of the Galactic Heroes: Die Neue These - Clash (2021) |
| Legend of the Galactic Heroes: Die Neue These - Intrigue (2022) |
| Legion (1983), William Peter Blatty |
The Exorcist III (1990) |
| Lemonade Mouth (2007), Mark Peter Hughes |
Lemonade Mouth (2011)[N 4] |
| The Leopard (1958), Giuseppe Tomasi di Lampedusa |
The Leopard (1963) |
| Less than Zero (1985), Bret Easton Ellis |
Less than Zero (1987) |
| Let Me Count the Ways (1965), Peter De Vries |
How Do I Love Thee? (1970) |
| Let the Right One In (Swedish: Låt den rätte komma in) (2004), John Ajvide Lindqvist |
Let the Right One In (2008) |
| Let Me In (2010) |
| A Letter to Five Wives (1945), John Klempner |
A Letter to Three Wives (1949) |
| A Letter to Three Wives (1985)[N 4] |
| The Life and Opinions of Tristram Shandy, Gentleman (1759–1767), Laurence Sterne |
A Cock and Bull Story (2006) |
| The Life Before Us (French: La vie devant soi) (1975), Romain Gary (as Émile Ajar) |
Madame Rosa (1977) |
| The Life Before Us (2010)[N 4] |
| The Life Ahead (2020) |
| Life of Pi (2001), Yann Martel |
Life of Pi (2012) |
| Lift to the Scaffold (French: Ascenseur pour l'échafaud) (1956), Noël Calef |
Elevator to the Gallows (1958) |
| The Light in the Forest (1953), Conrad Richter |
The Light in the Forest (1958) |
| The Light of Western Stars (1914), Zane Grey |
The Light of Western Stars (1918) |
| The Light of Western Stars (1925) |
| The Light of Western Stars (1930) |
| The Light of Western Stars (1940) |
| Like a Fire is Burning (1991), Gerald N. Lund |
The Work and the Glory: American Zion (2005) |
| Like Water for Chocolate (Spanish: Como agua para chocolate) (1989), Laura Esquivel |
Like Water for Chocolate (1992) |
| The Lincoln Lawyer (2005), Michael Connelly |
The Lincoln Lawyer (2011) |
| A Lion Is in the Streets (1945), Adria Locke Langley |
A Lion Is in the Streets (1953) |
| Lisa and Lottie (German: Das doppelte Lottchen) (1949), Erich Kästner |
Two Times Lotte (1950) |
| Hibari's Lullaby (ひばりの子守唄, Hibari no komoriuta) (1951) |
| Twice Upon a Time (1953) |
| The Parent Trap (1961)[N 11] |
| Kuzhandaiyum Deivamum (1965) |
| Leta Manasulu (1966) |
| Do Kaliyaan (1968) |
| Cheeky Little Angels (Korean: 개구장이 천사들, Gaegujangi Cheonsadeul) (1980) |
| Pyaar Ke Do Pal (1986) |
| The Parent Trap II (1987)[N 4][N 11] |
| Parent Trap III (1988)[N 4][N 11] |
| Parent Trap: Hawaiian Honeymoon (1989)[N 4][N 11] |
| Charlie & Louise – Das doppelte Lottchen (1994) |
| Dvynukės (1994)[N 4] |
| Strange Sisters (خواهران غریب) (1995) |
| The Parent Trap (1998)[N 12][N 11] |
| Kuch Khatti Kuch Meethi (2001) |
| Tur & retur (2003) |
| Two Times Lotte (2007) |
| Das doppelte Lottchen (2017)[N 4] |
| Little Caesar (1929), W. R. Burnett |
Little Caesar (1931) |
| Black Caesar (1973) |
| Hell Up in Harlem (1973) |
| Little Dorrit (serialised 1855–1857, published as a book 1857), Charles Dickens |
Little Dorrit (1913) |
| Little Dorrit (1920) |
| Little Dorrit (German: Klein Dorrit) (1934) |
| Little Dorrit (1987) |
| The Little Drummer Girl (1983), John le Carré |
The Little Drummer Girl (1984) |
| The Little White Horse (1946), Elizabeth Goudge |
The Secret of Moonacre (2009) |
| Live and Let Die (1954), Ian Fleming |
Live and Let Die (1973) |
| Live Flesh (1986), Ruth Rendell |
Live Flesh (Spanish: Carne trémula) (1997) |
| The Living and the Dead (French: D'entre les morts) (1954), Pierre Boileau and Thomas Narcejac |
Vertigo (1958) |
| The Lizard's Tail (1979), Marc Brandell |
The Hand (1981) |
| Loaded (1995), Christos Tsiolkas |
Head On (1998) |
| Logan's Run (1967), William F. Nolan and George Clayton Johnson |
Logan's Run (1976) |
| Lolita (1955), Vladimir Nabokov |
Lolita (1962) |
| Lolita (1997) |
| The Lone Star Ranger (1915), Zane Grey |
The Lone Star Ranger (1919) |
| The Lone Star Ranger (1923) |
| The Lone Star Ranger (1930) |
| Lone Star Ranger (1942) |
| Lonely Castle in the Mirror (かがみの孤城, Kagami no Kojō) (2017), Mizuki Tsujimura |
Lonely Castle in the Mirror (2022) |
| The Long Goodbye (1953), Raymond Chandler |
The Long Goodbye (1973) |
| The Long Walk (1979), Stephen King[N 13] |
The Long Walk (2025) |
| Longarm (1978–2006) (series), Lou Cameron[N 14] |
Longarm (1987)[N 4] |
| Looking for Trouble (1941), Virginia Spencer Cowles |
Ladies Courageous (1944) |
| The Looters (1968), John H. Reese |
Charley Varrick (1973) |
| Lord Jim (serialised 1899–1900, published as a book 1900), Joseph Conrad |
Lord Jim (1925) |
| Lord Jim (1965) |
| Lord of the Flies (1954), William Golding |
Lord of the Flies (1963) |
| Alkitrang dugo (1976) |
| Lord of the Flies (1990) |
| The Lord of the Rings (1954–1955)[N 15], J. R. R. Tolkien |
J. R. R. Tolkien's The Lord of the Rings (1978)[N 16] |
| The Return of the King (1980)[N 4][N 17] |
| The Lord of the Rings: The Fellowship of the Ring (2001)[N 18] |
| The Lord of the Rings: The Two Towers (2002)[N 18] |
| The Lord of the Rings: The Return of the King (2003)[N 18] |
| The Lord of the Rings: The War of the Rohirrim (2024)[N 19][N 18] |
| The Lord of the Rings: The Hunt for Gollum (2027)[N 9][N 18] |
| The Lords of Discipline (1980), Pat Conroy |
The Lords of Discipline (1983) |
| Lost Horizon (1933), James Hilton |
Lost Horizon (1937) |
| Lost Horizon (1973) |
| The Lost Ones (1961), Donald G. Payne |
The Island at the Top of the World (1974) |
| A Lost Paradise (失楽園, Shitsurakuen) (1997), Junichi Watanabe |
Lost Paradise (1997) |
| The Lost World (1912), Arthur Conan Doyle |
The Lost World (1925) |
| The Lost World (1960) |
| The Lost World (1992) |
| Return to the Lost World (1992)[N 20] |
| The Lost World (1998) |
| The Lost World (2001)[N 4] |
| King of the Lost World (2005) |
| The Lost World (1995), Michael Crichton |
The Lost World: Jurassic Park (1997) |
| A Love in Germany (German: Eine Liebe in Deutschland) (1978), Rolf Hochhuth |
A Love in Germany (1983) |
| Love Story (1970), Erich Segal |
Love Story (1970) |
| The Loved One (1948), Evelyn Waugh |
The Loved One (1965) |
| The Lovely Bones (2002), Alice Sebold |
The Lovely Bones (2009) |
| The Luck of Barry Lyndon (1844), William Makepeace Thackeray |
Barry Lyndon (1975) |
| The Lucky One (2008), Nicholas Sparks |
The Lucky One (2012) |
| Lydia Bailey (1947), Kenneth Roberts |
Lydia Bailey (1952) |