L
- KaBlam! ("Skaternity") - The Toasters (affiliated as The Moon Ska Stompers)
- Karen - Jack Marshall and Bob Mosher (performed by The Beach Boys)
- King of the Hill - The Refreshments
- King's Crossing - Jerrold Immel
- Kingdom Hospital ("Worry About You") - Ivy
- Knight Rider - Glen A. Larson and Stu Phillips (later arrangement of theme was done by Don Peake)
- Knots Landing - Jerrold Immel
- Kung Fu - Jim Helms
- The L Word ("The Way That We Live") - Betty
- L.A. Law - Mike Post
- La Femme Nikita - Mark Snow
- Laguna Beach: The Real Orange County ("Come Clean") - Hilary Duff
- Land of the Giants - John Williams
- Las Vegas ("A Little Less Conversation") - Elvis Presley (remix by Junkie XL)
- Laverne & Shirley ("Making Our Dreams Come True") - Cyndi Grecco
- Law & Order - Mike Post
- Leave It to Beaver ("The Toy Parade") - David Kahn, Melvyn Leonard and Mort Greene (Season 6 arrangement by Pete Rugolo)
- Lie to Me ("Brand New Day") - Ryan Star
- Life As We Know It ("Sooner or Later") - Michael Tolcher
- Life Goes On (A cover of The Beatles' "Ob-La-Di, Ob-La-Da") - Patti LuPone and the rest of the cast
- Lipstick Jungle ("The Bomb") - Bitter:Sweet
- Little House on the Prairie - David Rose
- Lone Ranger ("William Tell Overture") - Gioachino Rossini
- Lost in Space - John Williams (two themes)
- Love, American Style - Charles Fox and Arnold Margolin (performed first season by The Cowsills; seasons 2-5 by the Ron Hicklin Singers)
- The Love Boat - Paul Williams and Charles Fox (performed by Jack Jones)
- Love of Life ("The Life That You Love") - Carey Gold
Read more about this topic: List Of Television Theme Music, K