Slayer, Mastodon and Trivium have announced The Unholy Alliance Chapter III tour which will see the three bands hitting venues in Europe this fall.
| July 7, 2008 | Kaliakra Festival | Kavarna, Spain | |
| July 9, 2008 | Super Bock Super Rock | Lisbon, Spain | |
| July 11, 2008 | La Plata | Merida, Spain | |
| July 12, 2008 | Metalway Festival | Zaragoza, Spain | |
| October 27, 2008 | Manchester Arena | Manchester, UK | The Unholy Alliance Chapter III - with Trivium & Mastodon |
| October 28, 2008 | NEC | Birmingham, UK | The Unholy Alliance Chapter III - with Trivium & Mastodon |
| October 30, 2008 | Hammersmith Apollo | London, UK | The Unholy Alliance Chapter III - with Trivium & Mastodon |
| October 31, 2008 | Hammersmith Apollo | London, UK | The Unholy Alliance Chapter III - with Trivium & Mastodon |
| November 2, 2008 | CIA 7000 | Cardiff, Wales | The Unholy Alliance Chapter III - with Trivium & Mastodon |
| November 3, 2008 | SECC Hall 3 | Glasgow, Scotland, | The Unholy Alliance Chapter III - with Trivium & Mastodon |
| November 5, 2008 | Stadhalle | Offenbach, Germany | The Unholy Alliance Chapter III - with Trivium & Mastodon |
| November 6, 2008 | Palladium | Koln, Germany | The Unholy Alliance Chapter III - with Trivium & Mastodon |
| November 9, 2008 | Hanns-Martin-Schleyer-Halle | Stuttgart, Germany | The Unholy Alliance Chapter III - with Trivium & Mastodon |
| November 10, 2008 | Eishalle Deutweg | Winterthur, Switzerland | The Unholy Alliance Chapter III - with Trivium & Mastodon |
| November 11, 2008 | Le Zenith | Paris, France | The Unholy Alliance Chapter III - with Trivium & Mastodon |
| November 16, 2008 | Gasometer | Wein, Germany | The Unholy Alliance Chapter III - with Trivium & Mastodon |
| November 18, 2008 | Zenith | Munchen, Germany | The Unholy Alliance Chapter III - with Trivium & Mastodon |
| November 19, 2008 | Columbiahalle | Berlin, Germany | The Unholy Alliance Chapter III - with Trivium & Mastodon |
| November 29, 2008 | B1 Club | Moscow, Russia |