Def Leppard are an English rock band formed under the name Atomic Mass in 1977 in Sheffield as part of the new wave of British heavy metal. At the time of the band changing their name to Def Leppard, they consisted of bassist Rick Savage, lead singer Joe Elliott, guitarist Pete Willis and drummer Tony Kenning. The band currently consists of Savage and Elliott alongside drummer Rick Allen (since 1978) and guitarists Phil Collen (since 1982) and Vivian Campbell (since 1992).

Def Leppard evolved from Atomic Mass after vocalist Joe Elliott joined Atomic Mass in November 1977. The lineup of Elliott, drummer Tony Kenning, bassist Rick Savage, and guitarist Pete Willis was completed by the addition of guitarist Steve Clark in January 1978.^[1] The band played their first show on 18 July of that year, before recording their first EP in the fall with session drummer Frank Noon after Kenning's departure.

With the drummer position open, Rick Allen joined the band. Def Leppard recorded On Through the Night and High 'n' Dry as the five-piece of Savage, Willis, Elliott, Clark, and Allen before Pete Willis was fired in July 1982. Phil Collen of Girl replaced Willis, and the band went on to the most commercially successful period of their career, the releases of Pyromania and Hysteria.

31 December 1984, Rick Allen was involved in a car crash which involved the loss of his arm. Despite his injury, he continued to drum with the band, playing his first post accident show in Cork on 5 August 1986 with Status Quo drummer Jeff Rich providing backup.^[2]

On 8 January 1991, during a leave of absence from the band, guitarist Steve Clark was found dead in his home. Savage, Elliott, Allen, and Collen recorded their next album Adrenalize as a four-piece before Vivian Campbell joined as a second guitarist. The lineup of Def Leppard has not changed since Campbell joined the band on 15 April 1992, and is thus the longest standing lineup of the band since it began. The current lineup has released four compilations, three live albums, and seven studio albums, most recently Diamond Star Halos on 27 May 2022.

Image	Name	Years active	Instruments	Release contributions
	Rick Savage	1977–present	bass guitar occasional guitar backing vocals keyboards	all Def Leppard releases
	Joe Elliott		lead vocals additional guitar keyboards
	Rick Allen	1978–present	drums percussion backing vocals	all Def Leppard releases from On Through the Night (1980) to present
	Phil Collen	1982–present	lead and rhythm guitar backing vocals	all Def Leppard releases from Pyromania (1983) to present
	Vivian Campbell	1992–present		all Def Leppard releases from Retro Active (1993) to present

Image	Name	Years active	Instruments	Release contributions
	Tony Kenning	1977–1978	drums percussion	none
	Pete Willis	1977–1982	lead and rhythm guitar backing vocals	all Def Leppard releases from The Def Leppard E.P. (1979) to Pyromania (1983)
	Steve Clark	1978–1991 (his death)		all Def Leppard releases from The Def Leppard E.P. (1979) to Hysteria (1987) posthumous contributions on Retro Active (1993)

Image	Name	Years active	Instruments	Notes
	Jeff Rich	August 1986	drums percussion	Played alongside Rick Allen for the first live shows back since the 1984 accident that resulted in the loss of Allen's left arm.
	Sinéad Madden	2012	fiddle[3]
	Steve Brown	September 2014–November 2014 June 2015 May 2018	lead and rhythm guitar backing vocals	Trixter guitarist Steve Brown stepped in for Vivian Campell in 2014 and 2015 while Campbell underwent treatment for Hodgkin's lymphoma.[4][5] Brown also filled in for Phil Collen in May 2018 due to the birth of Collen's child.[6]

Image	Name	Years active	Instruments	Release contributions
	Frank Noon	31 October 1978	drums	The Def Leppard E.P. (1979)
	Chris Hughes	December 1979	synthesizers	"Hello America" from On Through the Night[7] (1980)
	Robert John "Mutt" Lange	1981–1987 1998–1999	backing vocals guitar	High 'n' Dry (1981) Pyromania (1983) Hysteria (1987) Adrenalize[8] (1992) "Ring of Fire" from Retro Active[9] (1993) "Promises" and "All Night" from Euphoria[10] (1999)
	John Kongos	1982	keyboards	Pyromania[11] (1983)
	Thomas Dolby, credited as Booker T. Boffin
	Melvin Mortimer, credited as Stumps Maximus	1987	lead vocals	"Release Me" B-side from Hysteria singles (2009)
	Pete Woodroffe	1991–1996	programming piano keyboard strings	Adrenalize[8] (1992) Retro Active[9] (1993) Slang[12] (1996)
	John Sykes	1991	backing vocals	Adrenalize[8] (1992)
	Phil "Crash" Nicholas		keyboards	"Stand Up (Kick Love into Motion)" from Adrenalize[8] (1992)
	P.J. Smith	April 1992	backing vocals	"Action" from Retro Active[9] (1993)
	Michael Kamen (died 2003)	April 1993	string arrangement	"Two Steps Behind" from Retro Active[9] (1993)
	Ian Hunter	1993	keyboards backing vocals	Honky tonk messiah on "Ride Into the Sun" from Retro Active[9] (1993) "The Golden Age of Rock 'n' Roll" from Yeah![13] (2006)
	Fiachna Ó Braonáin	March 1992	tin whistle	"From the Inside" from Retro Active[9] (1993) "You Can't Always Get What You Want" and "Little Wing" from Adrenalize B-sides[14] (2009)
	Liam Ó Maonlaí		grand piano
	Peter O'Toole		mandolin
	Stevie Vann	1995 2003–2005	vocals backing vocals	"When Love & Hate Collide" from Vault (1995) "20th Century Boy" from Yeah![13] (2006)
	Craig Pruess	1996	string and percussion arrangement	"Turn to Dust" from Slang[12] (1996)
	Gavyn Wright		string leader
	Av Singh		dohl
	Ram Naravan		Sarangi	intro for "Turn to Dust" from Slang[12] (1996)
	Shyam Vatish			outro for "Turn to Dust" from Slang[12] (1996)
	Damon "Demon" Hill	1998–1999	guitar	end solo on "Demolition Man" from Euphoria[10] (1999)
	Stan Schiller	2002		shredding tele licks on "Gravity" from X[15] (2002)
	Eric Carter		keyboards drum loops	""Now"" (2002) "You're So Beautiful" and "Everyday" from X[15] (2002)
	John "Bro" Campbell	2003–2005	saxophone	"20th Century Boy" (2002) "Street Life", "Drive-In Saturday" and "The Golden Age of Rock 'n' Roll" from Yeah![13] (2006)
	Justin Hawkins		backing vocals	"Hell Raiser" from Yeah![13] (2006)
	Anita Thomas-Collen			"The Golden Age of Rock 'n' Roll" from Yeah![13] (2006)
	Kristine Elliott
	Ronan McHugh		mellotron	"Drive-In Saturday" and "Little Bit of Love" from Yeah![13] (2006)
	Emm Gryner		piano backing vocals	"The Golden Age of Rock 'n' Roll" from Yeah![13] (2006)
	Marc Danzeisen		drums backing vocals	"American Girl" from Yeah![13] (2006)
	Tim McGraw	2008	lead vocals	"Nine Lives" from Songs from the Sparkle Lounge (2008)
	Dick Decent	2011	piano backing vocals	"Kings of the World" from Mirror Ball – Live & More [16] (2011)
	Ronan McHugh	2014–2015 2022	keyboards bouzouki Mellotron drum programming production	Def Leppard (2015)[17] Diamond Star Halos (2022)[18]
	Debbi Blackwell-Cook		backing vocals	"Sea of Love" from Def Leppard (2015)[17] "Kick", "Fire It Up", "Gimme a Kiss" and Angels (Can't Help You Now)" from Diamond Star Halos (2022)[18]
	Dave Bassett	2022		"Kick" and "Fire It Up" Diamond Star Halos (2022)[18]
	Alison Krauss		lead vocals	"This Guitar" and "Lifeless" from Diamond Star Halos (2022)[18]
	Mike Garson		piano	Goodbye for Good This Time" and "Angels (Can't Help You Now)" from Diamond Star Halos (2022)[18]
	Eric Gorfain		string arrangements	"This Guitar", "Goodbye for Good This Time" and "Angels (Can't Help You Now)" from Diamond Star Halos (2022)[18]

• Def Leppard discography
• List of awards and nominations received by Def Leppard

• Official Def Leppard website