| P.A.I.N | 1995 | — | — |
| P.M.T. | 1992 | — | — |
| Padded Cell | 2002 | — | — |
| Pagan Altar | 1978 | — | — |
| PagesEND | 2005 | — | — |
| Paice Ashton Lord | 1976 | 1978 | — |
| Palace | September 2012 | — | — |
| Pale Mist | 2007 | 2022 | — |
| Pale Saints | 1987 | 1996 | — |
| Pallas | 1980 | — | UK progressive rock |
| Panchiko | 1997 | — | — |
| Panic Room | 2005 | — | — |
| Pantheist | 2000 | — | — |
| Paper Lace | 1969 | — | — |
| Paradise Lost | 26 March 1988 | — | British metal / hard rock band |
| Paralex | 1977 | — | — |
| Parallax | 1 October 2019 | — | — |
| Parallel or 90 Degrees | 1996 | 2010 | — |
| Paranoia | 1983 | — | — |
| Paranormal Disposition | 1993 | 1996 | — |
| Pariah | 1988 | 1989 | — |
| Paris Angels | 1990 | 1992 | — |
| Part 1 | 1980 | — | — |
| Part Chimp | 2000 | — | — |
| Party Cannon | 2010 | — | — |
| Pascal Farful Band | 2015 | — | — |
| Patterns | 2010 | — | — |
| Patto | 1970 | 1973 | — |
| Peace | 2009 | — | — |
| Peach | 1992 | 1995 | — |
| Peasant's King | 1 January 2012 | — | — |
| Peckeruk | 9 May 1998 | — | — |
| Penance Stare | 2017 | — | — |
| Pendleton | 2001 | — | — |
| Pendragon | 1976 | — | UK progressive rock |
| Penetration | 1976 | — | — |
| Pentangle | 1967 | 1973 | — |
| Penthouse | October 1995 | November 2002 | — |
| Percy | 1 May 1996 | — | — |
| Perfume | 1993 | 1997 | — |
| Peru | 1991 | — | — |
| Pet Crow | 2016 | — | — |
| Pet Slimmers of the Year | January 2008 | — | — |
| Pete & the Pirates | 2006 | 2012 | — |
| Pete Brown & Piblokto! | 25 December 1969 | 1971 | — |
| Peter Hook & the Light | May 2010 | — | — |
| Phase | 16 December 2004 | — | — |
| Phatt Knappii | 2012 | — | — |
| Phoenix Gene | 22 July 2012 | — | — |
| Piano Magic | 1996 | 2017 | — |
| PIG | 1988 | — | — |
| Pig Irön | 2001 | — | UK-based rock band |
| Pigs Pigs Pigs Pigs Pigs Pigs Pigs | 2012 | — | — |
| Pilot | 1973 | 1978 | — |
| Pink Fairies | 1970 | 1988 | — |
| Pink Hearse | 2005 | — | — |
| Pink Industry | 1981 | 1987 | — |
| Pink Undulating Nuns | 1981 | 1981 | — |
| Pitchshifter | 1989 | — | — |
| Planet Gong | 1977 | 1979 | — |
| Planet Noir | 2025 | — | — |
| Plastic Ono Band | June 1969 | 2015 | — |
| Plastic Penny | November 1967 | August 1968 | — |
| Play Dead | November 1980 | January 1986 | 80's English post-punk group |
| Plummet Airlines | 1973 | 1977 | — |
| Pneumania | 1979 | — | — |
| POG | 2000 | — | — |
| Polarsets | 1 December 2008 | — | — |
| Polymath | 2007 | — | — |
| Pop Will Eat Itself | 1986 | 1986 | — |
| Popes of Chillitown | 2009 | — | — |
| Porcupine Tree | 1987 | — | — |
| Portent | 2005 | — | — |
| Portishead | 1991 | — | — |
| Postmortem Promises | 2006 | — | — |
| Potential Threat | 1981 | — | — |
| Power Quest | March 2001 | 2023 | — |
| Praecantator | 2016 | — | — |
| Prairies | 1 May 2011 | — | — |
| Pram | 1990 | — | — |
| Praying Mantis | 1974 | — | UK rock/metal band |
| Precious Little | 1976 | 1981 | — |
| Prefab Sprout | 1978 | — | — |
| PRESIDENT | 2025 | — | — |
| Pretenders | March 1978 | — | English‐American rock band |
| Pretty Vicious | 2014 | — | — |
| Primal Rock Rebellion | 2011 | — | — |
| Primal Scream | 1982 | — | Scottish rock band |
| Primitive Knot | 2014 | — | — |
| Prinzhorn Dance School | 2004 | — | — |
| Pro-jekt | January 2001 | — | — |
| Procol Harum | 1967 | 2022 | — |
| Profiler | 2017 | — | — |
| ProjeKct One | 1 December 1997 | 4 December 1997 | — |
| Propellerheads | 1995 | 2003 | — |
| Prospekt | 2008 | — | — |
| Protectors | 1 July 2009 | — | — |
| Psapp | 2002 | — | — |
| Psychic TV | 1981 | 13 March 2020 | — |
| Psychlona | 2016 | — | — |
| Psython | 2014 | — | — |
| Public Enemy | 1980 | 1992 | — |
| Public Image Ltd | 1978 | — | — |
| Public Service Broadcasting | 2010 | — | British rock four‐piece |
| Pull Tiger Tail | 2 February 2006 | 2009 | — |
| Pulp | 1978 | — | — |
| Punishment of Luxury | December 1976 | — | — |
| Pure Reason Revolution | 2003 | — | — |
| Puressence | January 1991 | — | — |
| Pythia | 2007 | — | — |