Wacken Open Air 2004 was held from Thursday, 5 August to Saturday, 7 August.
This edition of the festival marked the introduction of the Metal Battle, a battle of the bands-style tournament in which the finalists from their respective countries perform on the W.E.T. Stage, with the winner receiving endorsements, a worldwide label deal, and a slot on the W.E.T. Stage at the following year's festival. Eleven finalists competed in 2004, with Reckless Tide from Germany emerging as the winner.
Wacken Open Air 2010 was held from Wednesday, 4 August to Saturday, 7 August. The festival was headlined by Iron Maiden, Alice Cooper, Mötley Crüe, and Slayer.
Several bands played special sets at the festival. Corvus Corax played a show entitled "Wacken Burns" to close out the main stage performances on Friday. To celebrate their 30th anniversary, Grave Digger performed their 1996 album, Tunes of War, in its entirety. Likewise, Tiamat performed their entire 1994 album, Wildhoney, in honor of both their 20th year together and the 15th birthday of the album.
Victims of Madness
No Dawn† Snakebite†
By the Patient† Forever Storm†
Missing in Action†
Orcus O Dis†
Prayers of Sanity†
Black Out Beauty† Ghost Brigade
Crisix (Crysys) Gojira
Wacken Open Air 2012 was held from Thursday, 2 August to Saturday, 4 August.
From this year onwards, the W.E.T. Stage under the Headbanger's Ballroom tent had a second stage, known as the Headbanger's Stage, added right next to it. The expanded tent was renamed the Bullhead City Circus.
Rain Shatter Band from Guadalajara, México. In the Bullhead City Circus Stage W:O:A 2012
Victims of Madness
Spring and Autumn
J.T. Ripper SIC
An Apple a Day
Kill With Hate
Count to Six
GOD: The Barbarian Horde
Karma Zero Mambo Kurt
Wacken Open Air 2014 was held from Thursday, 31 July to Saturday, 2 August. On 6 August 2013, it was announced that it was already sold out, in less than 48 hours.
The confirmed bands Death Angel and Iced Earth canceled their summer shows including Wacken Open Air.
27–29 August 2009: 9mm, Agathodaimon, Age of Evil, Alestorm, AM/FM, Axxis, Bai Bang, Chrome Molly, Cripper, Debauchery, Der W, Dezperados, Doro, Drone, Edguy, Eisbrecher, Fatal Smile, Feuerschwanz, Five and the Ted One, Flotsam & Jetsam, Frei.Wild, Girlschool, Grave Digger, Hämatom, Hank III & Assjack, Heaven Shall Burn, Herman Frank Band, In Extremo, Krypteria, The New Black, Parity Boot, SAHG, Secrets of the Moon, Slayer, Stainless Steel, Stratovarius, Suidakra, Tribe, U.D.O., Volbeat, Warpath
28–30 August 2009: Age of Evil, Agathodaimon, Alestorm, Axxis, Bai Bang, Cripper, Debauchery, Der W, Dezperadoz, Dirty Deeds, Doro, Edguy, Eisbrecher, Fatal Smile, Five and the Red One, Flotsam & Jetsam, Frei.Wild, Girlschool, Hank III, Herman Frank Band, Heaven Shall Burn, In Extremo, J.B.O, Kneipenterroristen, Krypteria, Mob Rules, Ohrenfeindt, Parity Boot, SAHG, Secrets of the Moon, Slayer, Stratovarius, Suidakra, sexy Glitter, Torfrock, Tribe, U.D.O, Victims of Madness, Volbeat, Warpath ollelelerer