L
- L.A. Law (1986–1994), legal drama
- The L Word (2004–2009), drama
- Ladies Man (1980–1981), sitcom
- Ladies Man (1999–2001), sitcom
- Laguna Beach: The Real Orange County (2004–2006), reality/ teen drama
- Lancer (1968–1970), western
- The Land Before Time (2007–2008), cartoon
- Land of the Giants (1968–1970), science fiction
- Land of the Lost (1974–1976), children's
- Land of the Lost (1991–1992), children's
- Land's End (1995–1996), crime drama
- Lanigan's Rabbi (1977), crime drama
- Laramie (1959–1963), western
- Laredo (1965–1967), western
- Larry King Live (1985–2010), talk show
- The Larry Sanders Show (1992–1998), comedy
- Las Vegas (2003–2008), drama
- Lassie (1954–1973), drama
- Last Call with Carson Daly (January 7, 2002 – present), talk show
- Last Comic Standing (2003–2010), reality/ talent
- Last Man Standing (October 11, 2011 – present), comedy
- The Last Resort (1979–1980), sitcom
- The Late Late Show with Craig Ferguson (January 3, 2005 – present), talk show (co-produced with United Kingdom)
- The Late Late Show with Craig Kilborn (1999–2004), talk show
- Late Night with Conan O'Brien (1993–2009), talk show
- Late Night with David Letterman (1982–1993), talk show
- The Late Show with David Letterman (August 30, 1993 – present), talk show
- Late Night with Conan O'Brien (1993–2009), talk show
- Laugh Inn (1968–1973), sketch comedy
- Laurie Hill (1992), sitcom
- Laverne & Shirley (1976–1983), sitcom
- The Law & Harry McGraw (1987–1988), mystery
- Law & Order (1990–2010), legal drama/police procedural
- Law & Order: Crime & Punishment (2002–2004), reality
- Law & Order: Criminal Intent (2001–2011), legal drama/police procedural
- Law & Order: Los Angeles (2010–2011), legal drama/police procedural
- Law & Order: Special Victims Unit (September 20, 1999 – present), legal drama/police procedural
- Law & Order: Trial by Jury (2005–2006), legal drama
- The Law and Mr. Jones (1960–1962), crime drama
- Law of the Plainsman (1959–1960), western
- Lawman (1958–1962), western
- The Lawrence Welk Show (1951–1982), music/ variety
- LAX (2004–2005), drama
- The Lazarus Man (1996), western
- The Lazarus Syndrome (1979), medical drama
- The League ( October 29, 2009 – present), sitcom
- Leap of Faith (2002), sitcom
- Leap Years (2001–2002), drama
- Leave It to Beaver (1957–1963), sitcom
- Leg Work (1987), crime drama
- Legacy (1998–1999), western
- Legend (1995), sci-fi / western
- The Legend of Prince Valiant (1991–1994), cartoon
- The Legend of Tarzan (2000–2003), cartoon
- Legends of the Hidden Temple (1993–1995), children's game show
- Legion of Super Heroes (2006–2008), cartoon
- Lenny (1990–1991), sitcom
- The Leslie Uggams Show (1969), variety
- Less than Perfect (2002–2006), sitcom
- Let's Make a Deal (1963–1991, 2009 – present), game show
- Leverage (December 7, 2008 – present), drama
- Lewis & Clark (1981–1982), sitcom
- Liar's Club (1969, 1976–1979, 1988–1989), game show
- Lidsville (1971–1973), children's
- Lie to Me (2009–2011), crime drama
- Life (2007–2009), crime drama
- The Life and Legend of Wyatt Earp (1955–1961), western
- The Life and Times of Grizzly Adams (1977–1978, 1982), adventure
- Life as We Know It (2004–2005), drama
- Life Goes On (1989–1993), drama
- Life Is Wild (2007–2008), drama
- The Life of Riley (1949–1950, 1953–1958), sitcom
- Life on a Stick (2005), sitcom
- Life on Mars (2008–2009), fantasy/ crime drama
- Life Unexpected (2010–2011), drama
- Life with Bonnie (2002–2004), sitcom
- Life with Derek (2005–2009), sitcom
- Life with Elizabeth (1953–1955), sitcom
- Life with Louie (1994–1998), animated sitcom
- Life with Lucy (1986), sitcom
- Life with Roger (1996–1997), sitcom
- Life's Work (1996–1997), sitcom
- Light's Out (1946–1952), anthology/ drama
- Lights Out (2011), drama
- Like Family (2003–2004), sitcom
- Lil' Bush (2007–2008), animated comedy
- Linc's (1998–2000), drama/ comedy
- Lincoln Heights (2007–2009), drama
- Line of Fire (2003–2004), crime drama
- The Lineup (1954–1960), crime drama
- Lingo (1987–1988, 2002–2007, 2011–present), game show
- Lipshitz Saves the World (2006), comedy
- Lipstick Jungle (2008–2009), comedy/ drama
- Listen Up! (2004–2005), sitcom
- Little Britain USA (2008), sketch comedy
- Little House on the Prairie (1974–1982), western / drama
- Little Men (1998–1989), drama
- The Little Mermaid (1992–1994), cartoon
- The Littles (1983–1985), animated
- Little Robots
- Live Shot (1995–1996), drama
- Live with Regis and Kelly (April 4, 1983 – present), talk show
- Living Dolls (1989), sitcom
- Living Single (1993–1998), sitcom
- Living with Fran (2005–2006), sitcom
- Lizzie McGuire (2001–2004), teen sitcom
- Logan's Run (1977–1978), science fiction
- Lois & Clark: The New Adventures of Superman (1993–1997), sci-fi / comedy
- The Lone Gunmen (2001), science fiction
- The Lone Ranger (1949–1957), western
- The Lone Ranger (1966–1969), cartoon
- Lone Star (September 20, 2010–September 27, 2010), drama
- Lonesome Dove: The Series (1994–1995), western
- Longstreet (1971–1972), crime drama
- The Loop (2006–2007), sitcom
- Lopez Tonight (November 9, 2009 – present), talk show, variety
- The Loretta Young Show (1953–1961), sitcom
- Lost (2004–2010), thriller/ sci-fi/ mystery
- Lost in Space (1965–1968), science fiction
- Lotsa Luck (1973–1974), sitcom
- Lou Grant (1977–1982), drama
- The Louie Show (1996), sitcom
- Love, American Style (1969–1974), comedy anthology
- Love & War (1992–1995), sitcom
- Love and Marriage (1959–1960), sitcom
- Love and Marriage (1996), sitcom
- The Love Boat (1977–1986), comedy
- The Love Boat: The Next Wave (1998–1999), comedy
- Love Connection (1983–1994), game show
- Love, Inc. (2005–2006), sitcom
- Love Is a Many Splendored Thing (1967–1973), soap opera
- Love Monkey (2006), drama/ comedy
- Love on a Rooftop (1966–1967), sitcom
- Love, Sidney (1981–1983), sitcom
- Love That Bob (1955–1959), sitcom
- Love Thy Neighbor (1973), sitcom
- Loving (1983–1995), soap opera
- Lucan (1977–1978), drama
- Lucas Tanner (1974–1975), drama
- Luis (2003), sitcom
- Lucky (2003), comedy
- The Lucy Show (1962–1968), sitcom
- The Lucy–Desi Comedy Hour (1957–1960), sitcom
- Lush Life (1996), sitcom
- The Lyon's Den (2003), legal drama
Read more about this topic: List Of American Television Series