| Kade Storm | 2003 | — | — |
| Kairi | 2002 | — | — |
| Kaiser Chiefs | 2003 | — | — |
| Kajagoogoo | 1982 | 1985 | — |
| Kaleidoscope | 1967 | 1970 | — |
| Kallon | 1 July 2017 | — | — |
| Kardinal X | 2019 | — | — |
| Karnataka | 1997 | — | — |
| Karvel | 15 July 2010 | — | — |
| Kasabian | 1997 | — | GB | rock |
| Katch 22 | 1 August 1966 | — | — |
| Katrina and the Waves | 1981 | 1999 | British‐American rock band |
| Keane | 1995 | — | — |
| Keef Hartley Band | 1968 | 1972 | — |
| Keep Sake | 28 March 2014 | — | — |
| Keith | 2002 | October 2009 | — |
| Kenelis | 5 June 2003 | — | — |
| Kenickie | August 1994 | 15 October 1998 | — |
| Kero Kero Bonito | 2011 | — | — |
| Khan | April 1971 | October 1972 | — |
| Khime | 1998 | 2002 | — |
| Kid Canaveral | 2005 | — | — |
| Kids in Glass Houses | 5 May 2004 | 31 October 2014 | — |
| Kilburn and the High Roads | 1970 | 1975 | — |
| Kill Shelter | 2017 | — | — |
| Kill, The Icon! | 1 January 2021 | — | — |
| Killers | 1991 | 2003 | British heavy metal, a.k.a. Paul Di'Anno's Killers |
| Killing Floor | 1968 | — | — |
| Killing Joke | 1979 | — | UK punk/goth/industrial band |
| Kilnaboy | 2003 | — | — |
| Kinch | 2007 | — | — |
| Kinesis | 2000 | 2005 | — |
| King Adora | 1998 | 2005 | — |
| King Bee | 2015 | — | — |
| King Crimson | 30 November 1968 | 2021 | — |
| King Goat | 2012 | — | — |
| King Hannah | 2017 | — | — |
| King Kurt | 1981 | — | — |
| King Liar | 17 April 2019 | — | — |
| King Prawn | 1993 | — | — |
| King Size Taylor and the Dominos | 1958 | 1964 | — |
| King Trigger | 1982 | — | — |
| King Witch | 2015 | — | — |
| Kingmaker | 1990 | 1995 | — |
| Kinzoku | 2018 | — | — |
| Kira Mac | 2018 | — | — |
| Kismet HC | 1989 | — | — |
| Kiss the Blade | 1984 | — | — |
| Kissing the Pink | 1980 | — | — |
| Klaxons | 5 November 2005 | 31 January 2015 | — |
| Knifeworld | 2009 | — | — |
| Kone | 15 January 2014 | — | — |
| Kong Lives | November 2016 | — | — |
| Koobors Law | 2007 | — | — |
| Kosheen | 1998 | — | — |
| Koyo Bloom | 2015 | — | — |
| Kraynium | 1998 | 2000 | — |
| Krew | 1985 | 1987 | — |
| Kroh | 2011 | — | — |
| Krokodil | 21 May 2011 | — | — |
| Kubb | 2005 | 2006 | — |
| Kula Shaker | 1995 | — | — |
| Kull | 2012 | — | — |
| Kursaal Flyers | 1973 | — | — |
| Kyteler | 2016 | — | — |