| Lacerator | 1990 | — | — |
| Ladyfuzz | March 2004 | 5 April 2007 | — |
| Ladytron | 1999 | — | UK electronic band |
| Laika | 1993 | — | — |
| Lamb | 1996 | — | English electronic music duo from Manchester |
| Lambrini Girls | 2019 | — | — |
| Land Of Barbara | 1992 | 1994 | — |
| Landmarq | 1990 | — | — |
| Late of the Pier | 2004 | — | — |
| Latin Quarter | August 1983 | — | — |
| Lavinia Whateley | 2023 | — | — |
| Lawless | 2012 | — | — |
| Lawnmower Deth | 1987 | April 1995 | — |
| Lawson | 2009 | — | — |
| Lay It on The Line | 12 January 2012 | — | — |
| Layers | 1 March 2011 | — | — |
| Leaf Hound | 1969 | — | — |
| Lean Logic | 18 May 2020 | — | — |
| Leatherface | August 1988 | 2012 | — |
| Led Zeppelin | 1968 | 25 September 1980 | — |
| Leftfield | 1989 | — | — |
| Leisur Hive | 1995 | 2008 | — |
| Lentil | 2003 | 2009 | — |
| Les Fleur de Lys | 1964 | 1969 | — |
| Lesbian Bed Death | 2004 | — | — |
| Let Loose | 1987 | — | — |
| Level 42 | 1980 | — | — |
| Levellers | 1988 | — | — |
| Levitation | 1990 | 1994 | — |
| Leyton Buzzards | 1976 | 1980 | — |
| Liam Frost and the Slowdown Family | 2003 | — | — |
| Lieutenant Pigeon | 1972 | — | — |
| LIFE | 1 January 2013 | — | — |
| Life Cycle | 1986 | — | — |
| Life Without Buildings | 1999 | 2002 | — |
| Lifeless | 2006 | — | — |
| Light Bearer | 2010 | 2015 | — |
| Lighthouse Family | 1993 | — | — |
| Like Giants | 14 June 2019 | — | — |
| Likes Lions | 15 November 2009 | — | — |
| Limelight | 1967 | 1997 | — |
| Lindisfarne | 1970 | May 2004 | UK folk & progressive rock band |
| Lionheart | 1980 | — | — |
| Lionrock | 1991 | — | — |
| Liquorice John Death | 1970 | 1970 | — |
| Little Comets | 2008 | — | — |
| Little Fears | 1 October 2011 | — | — |
| Little Free Rock | 1969 | 1974 | — |
| Little Man Tate | September 2005 | 13 July 2009 | — |
| Liverpool Echo | 1973 | — | — |
| Living in a Box | 20 December 1985 | 6 June 1991 | — |
| Living Legends | 1981 | — | — |
| Livingston | 2002 | — | — |
| Lloyd Cole and the Commotions | 1982 | — | — |
| Loathe | 2014 | — | — |
| Locean | 2013 | — | — |
| Lock Up | 1998 | — | — |
| London | 1976 | 1978 | — |
| London Cowboys | 1980 | — | — |
| London Grammar | 2009 | — | An English indie pop and electronic trio formed in Nottingham, England, in 2009. |
| Long Fin Killie | 1993 | — | — |
| Longpigs | 1993 | 2000 | — |
| Longview | 2001 | 2015 | — |
| Look Back in Anger | 1981 | 1984 | — |
| Loop | 1985 | 1990 | — |
| Looper | 1998 | — | — |
| Lord of Putrefaction | 1988 | 1991 | — |
| Los Bitchos | 2017 | — | — |
| Love Affair | 1966 | 1971 | 66–71 UK pop group “Everlasting Love” |
| Love and Money | 1985 | 1994 | — |
| Love Sculpture | 1966 | 1970 | — |
| Lowen | 2017 | — | — |
| Lower Than Atlantis | 19 August 2007 | 11 May 2019 | — |
| Lowgold | 1997 | 2009 | — |
| Lowlife | 1985 | 1997 | — |
| Lucy | 1976 | 1978 | — |
| Ludus | August 1978 | 1984 | — |
| Lunar Bird | 1 May 2017 | — | — |
| Lunar Mantra | 2013 | — | — |
| Lunarca | 2022 | 2024 | — |
| Lung Leg | 1994 | 1999 | — |
| Lush | 1987 | 25 November 2016 | UK shoegaze band |
| Lvcifyre | 2007 | — | — |
| Lychgate | 2012 | — | — |
| Lyman Alpha Blob | 3 February 2014 | — | — |
| Lyrian | 2006 | — | — |
| Lyrinx | 2004 | — | — |
| LÄYKES | 1 January 2017 | — | — |