| Inconcessus Lux Lucis | 2009 | — | — |
| Indecent Exposure | 1981 | — | — |
| Indica Blues | 2014 | — | — |
| Indigo Daydream | 15 March 2021 | — | — |
| Infant Bile | 2005 | — | — |
| Infested Angel | 2019 | — | — |
| Ingested | 2002 | — | — |
| Inkubus Sukkubus | 1989 | — | — |
| Insecure Men | 2016 | — | — |
| Inspiral Carpets | 1989 | — | — |
| Intra Tenebrae | 2008 | — | — |
| Iona | 1990 | — | Celtic folk/rock band from the United Kingdom |
| IQ | 1981 | — | British progressive rock band |
| Iroha | 2008 | — | — |
| Iron Grave | 9 June 2012 | — | — |
| Iron Maiden | 25 December 1975 | — | English heavy metal band |
| Is Tropical | 2009 | — | — |
| Isen Torr | 2003 | — | — |
| It Bites | 1982 | — | — |
| Jade Warrior | 1970 | — | — |
| JAG | 2003 | — | — |
| Jaguar | December 1979 | — | — |
| Jah Wobble’s Invaders of the Heart | 1983 | — | — |
| James | 1982 | — | Manchester indie rock band |
| Jamiroquai | 1992 | — | — |
| Janison Edge | 1997 | — | — |
| Janus | 1971 | — | — |
| Jasmine Minks | 1983 | — | — |
| JAWS | 2012 | — | — |
| Jellybread | 1968 | — | — |
| Jellyfish Kiss | 1986 | — | — |
| Jeremy Pie | 1 January 2024 | — | — |
| Jesu | 2003 | — | — |
| Jesus Jones | August 1988 | — | — |
| Jethro Tull | December 1967 | — | — |
| Jetplane Landing | 1999 | — | — |
| Jimmy the Squirrel | 2005 | — | — |
| Jive Bunny & the Mastermixers | 1988 | — | — |
| JK Historian | 1 January 2018 | — | — |
| Joanna Gruesome | 2010 | — | — |
| Jody Grind | November 1966 | — | — |
| Johnny Foreigner | December 2005 | — | — |
| Judas Priest | 1969 | — | — |
| Juicy Lucy | 1969 | — | — |
| Jump | 1990 | — | — |
| Jungle Doctors | 18 November 2010 | — | — |
| Just Add Monsters | 2008 | — | — |
| Just Three Guys | April 2011 | — | — |
| Kade Storm | 2003 | — | — |
| Kairi | 2002 | — | — |
| Kaiser Chiefs | 2003 | — | — |
| Kallon | 1 July 2017 | — | — |
| Kardinal X | 2019 | — | — |
| Karnataka | 1997 | — | — |
| Karvel | 15 July 2010 | — | — |
| Kasabian | 1997 | — | GB | rock |
| Katch 22 | 1 August 1966 | — | — |
| Keane | 1995 | — | — |
| Keep Sake | 28 March 2014 | — | — |
| Kenelis | 5 June 2003 | — | — |
| Kero Kero Bonito | 2011 | — | — |
| Kid Canaveral | 2005 | — | — |
| Kill Shelter | 2017 | — | — |
| Kill, The Icon! | 1 January 2021 | — | — |
| Killing Floor | 1968 | — | — |
| Killing Joke | 1979 | — | UK punk/goth/industrial band |
| Kilnaboy | 2003 | — | — |
| Kinch | 2007 | — | — |
| King Bee | 2015 | — | — |
| King Goat | 2012 | — | — |
| King Hannah | 2017 | — | — |
| King Kurt | 1981 | — | — |
| King Liar | 17 April 2019 | — | — |
| King Prawn | 1993 | — | — |
| King Witch | 2015 | — | — |
| Kinzoku | 2018 | — | — |
| Kira Mac | 2018 | — | — |
| Kismet HC | 1989 | — | — |
| Kiss the Blade | 1984 | — | — |
| Kissing the Pink | 1980 | — | — |
| Knifeworld | 2009 | — | — |
| Kone | 15 January 2014 | — | — |
| Kong Lives | November 2016 | — | — |
| Koobors Law | 2007 | — | — |
| Kosheen | 1998 | — | — |
| Koyo Bloom | 2015 | — | — |
| Kroh | 2011 | — | — |
| Krokodil | 21 May 2011 | — | — |
| Kula Shaker | 1995 | — | — |
| Kull | 2012 | — | — |
| Kursaal Flyers | 1973 | — | — |
| Kyteler | 2016 | — | — |
| Ladytron | 1999 | — | UK electronic band |
| Laika | 1993 | — | — |
| Lamb | 1996 | — | English electronic music duo from Manchester |
| Lambrini Girls | 2019 | — | — |
| Landmarq | 1990 | — | — |
| Late of the Pier | 2004 | — | — |
| Latin Quarter | August 1983 | — | — |
| Lavinia Whateley | 2023 | — | — |