| Artist | Year at the Gathering |
| A.Z. | 2015 |
| A.Z. The Fallen | 2017 |
| ABiCA | 2008 |
| Abnormal | 2006 |
| Above The Law | 2010 |
| Abstrakt | 2019 |
| Afroman | 2008, 2010 |
| Age Ov Reason | 2006 |
| Aint Got No Sense | 2006 |
| AJ Jordan | 2011, 2012 |
| Ajax | 2007, 2009, 2010, 2011, 2012, 2014 |
| Alex Jonestown Massacre | 2019 |
| Alla Xul Elu | 2016, 2017, 2018 |
| Alphamatic | 2013 |
| Amanda | 2008 |
| American Slang | 2019 |
| American Grim | 2017 |
| Amerikan Overdose | 2015, 2022 |
| Anarchy Bronze | 2018 |
| Andrew W.K. | 2008 |
| AnigmA | 2011 |
| Anybody Killa | 2002, 2003, 2004, 2005, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019 |
| Apocalyse | 2007 |
| Apparition | 2007 |
| Aqualeo | 2013, 2015 |
| Armed & Dangerous | 2006 |
| Ascent To | 2016 |
| Asking Alexandria | 2016 |
| Askmeificare | 2014 |
| Astronautalis | 2019 |
| Atilla | 2016, 2018 |
| A-Town Mob | 2007 |
| Autopzy | 2007 |
| Awesome Dre | 2008, 2009, 2010, 2012 |
| Axe Murder Boys | 2005, 2006, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 |
| Azylum Inmates | 2011, 2012 |
