Karl Rudolf "Charlie" Bauerfeind (born 30 May 1963)^[1] is a German sound engineer and producer who has worked mostly with power metal bands such as Angra, Blind Guardian, Helloween, Primal Fear, Rage, HammerFall and Saxon.

• Angels Cry – 1993
• Holy Land – 1995/1996
• Freedom Call – 1996

• Nightfall in Middle-Earth – 1997/1998 (mixing of "Mirror Mirror" track, various recordings)
• A Night at the Opera – 2000/2001
• A Twist in the Myth – 2006
• At the Edge of Time – 2010
• Beyond the Red Mirror – 2015

• Stairway to Fairyland – 1999
• Crystal Empire – 2001
• Eternity – 2002 (mixing)

• Insanity and Genius – 1993 (mixing)
• Land of the Free – 1994/1995
• Somewhere Out in Space – 1997 (mixing)

• Bang! 2014

• Crimson Thunder – 2002
• Chapter V: Unbent, Unbowed, Unbroken – 2005
• Threshold – 2006
• No Sacrifice, No Victory – 2009

• The Dark Ride – 2000
• Treasure Chest – 2002
• Rabbit Don't Come Easy – 2003
• Keeper of the Seven Keys: The Legacy – 2005
• Gambling with the Devil – 2007
• Unarmed – Best of 25th Anniversary – 2009
• 7 Sinners – 2010
• Straight Out of Hell – 2013
• My God-Given Right – 2015
• Helloween – 2021

• Beyond the Gates – 2004

• Silent Reign of Heroes – 1998 (mixing)

• Unity – 2002
• Soundchaser – 2003
• Speak of the Dead – 2006 (mixing)
• Carved in Stone – 2008 (mixing)
• Strings to a Web – 2010
• 21 – 2012

• Metalhead – 1999
• Lionheart – 2004
• The Inner Sanctum – 2007
• Into the Labyrinth – 2009

• Empire in Ruins^[2] – 2011
• Smoke and Mirrors^[3] – 2014

• The Dreamlake – 1994

• Hero (2008)
• Tribe of Force (2010)
• Dawn of the Brave (2014)

• Evolution – 1992
• Vipera Sapiens – 1992

• Official website (archived)