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- The L.A. Bust '66 - The Turtles Present the Battle of the Bands
- L.A. Freeway - The Greatest American Hero
- Rita La Fleur - The Simpsons
- Sasha La Fur - All Dogs Go To Heaven 2
- Lily La Rose - Jem
- Lady Die - Friday the 13th: The Series
- Lady In The Radiator - Eraserhead
- Lambie Pie - Lambie Pie
- Lambsblood - This Is Spinal Tap
- La Rif - Espedair Street
- The Larry Davis Experience (also known as The Larry Davis Dance Kings) - The Simpsons
- The Last Days - The Last Days
- The Late Term Abortions - Summer of Sam
- Eddie Larran - In The Heat of the Night
- Laura Holloway - Jem, "Alone Again"
- The Lavender Fudge Experience - Whatever Happened to Robot Jones?
- Lazor - Homestar Runner
- The Llama Lords Of Science - The Adventures of Jimmy Neutron: Boy Genius
- Leaky Mules - Round House
- The Leatherettes - Jem
- The Legend - A Clockwork Orange
- Legends of Brass - That Thing You Do!
- Lemonade Mouth - Lemonade Mouth
- Lemon-Aid - The Flintstone Kids
- Lenny and the Squigtones - Laverne and Shirley
- Les Garçons de la Plage - The Rutles
- Les Rock Stars - The Simpsons
- Leslie - Friends
- Lester's Possum Park Band - A Goofy Movie
- Dominick Lerner - Jem, "The Jem Jam" Parts 1 and 2, "Hollywood Jem Part 2: And The Winner Is...", "Riot's Hope", parody of Michael Jackson
- Lena Lerner - Jem, "The Jem Jam" Parts 1 and 2, "Hollywood Jem Part 2: And The Winner Is...", "Riot's Hope", parody of Tina Turner
- Lida Rosario Vazquez and Melinda Jacinto - MADtv
- Lily Chou-Chou - All About Lily Chou-Chou
- Liquorice Comfits - High Fidelity
- Limozeen - Homestar Runner
- The Limp Lizards - Jem, "The Beginning", "In Stitches", "The Bands Break Up"
- Loretta Line - ] April 1997 I Was Country When I Was In School Pull Out Prank CD cover
- Lionel Fishie - SpongeBob SquarePants
- Little Chrissy and the Alphabeats - Sesame Street
- Little Jerry and the Monotones - Sesame Street
- Little Nephew - Achewood
- The Lizards - The Comic Strip, Street Frogs
- La Llorona - Love and Rockets
- Loded Diper - Diary of a Wimpy Kid
- Loli-Pop - Popular
- The Lone Rangers - Airheads
- The Looters - Ladies and Gentlemen, The Fabulous Stains
- Los Sapos Guapos - Thumbelina (1994 film)
- The Loserz - George Lopez
- Louie's Place Band - TaleSpin
- Louise - Glitter
- Bob Love - Shaman King (Volume 19 of the graphic novels)
- Foxxy Love - Drawn Together
- Jake Long - American Dragon: Jake Long
- Long Cool Woman In A Black Dress - "Long Cool Woman In A Black Dress", The Hollies song
- Lonny Lord - Rat Pfink a Boo Boo
- The Lords of The Underworld - South Park
- The Lorells - Doctor Who serial Delta and the Bannermen* Lo/Rez - Idoru by William Ford Gibson
- Lola Heatherton - SCTV
- Lost Souls?- Lost Souls by Poppy Z. Brite
- The Louis Stevens Experience - Even Stevens
- The Louisiana Gator Boys - Blues Brothers 2000
- Love and Rockets - A fictional band in Love and Rockets, complained that the "real" Love and Rockets stole their name. They broke up and formed four separate bands, each also called "Love and Rockets".
- Loveburger - Can't Hardly Wait
- Love Fist - Grand Theft Auto: Vice City
- Love Händel - Phineas and Ferb
- Lucy Ricardo - I Love Lucy
- Ludi-Crest - The Simpsons
- Lula Lillywhite - Samurai Jack
- Luna Dark - Jem, "The Jem Jam" Parts 1 and 2, "The Bands Break Up", parody of Madonna Ciccone
- Lurleen Lumpkin - The Simpsons
- Lyzzard Skyzzard - Dinosaurs
- Lynn Minmay - The Super Dimension Fortress Macross (later adapted as part of Robotech)
Read more about this topic: List Of Fictional Music Groups