| Artist | Year at the Gathering |
| S. King | 2015 |
| S. Musket | 2015 |
| S.H.I. | 2008 |
| S.O.N. | 2021, 2024 |
Saint Diablo |
2024 |
| Saint Luke | 2006, 2007, 2011 |
| Saliva | 2011 |
| Santana Tribute | 2018 |
| Scare Don't Fear | 2016 |
| Scarface | 2009 |
| Scattered Hamlet | 2019 |
Scream At The Sky |
2024 |
| Scum | 2008, 2009, 2010, 2011, 2012, 2014 |
Scum & Insane Poetry |
2024 |
| Scythe Gang 666 | 2022, 2024 |
| Sedated | 2012, 2013, 2014, 2016 |
| Seed Of 6ix | 2018 |
| Seenloc | 2011, 2023 |
| September Mourning | 2017, 2019 |
| Seth Brock | 2013, 2014 |
| Sevendust | 2013 |
| Sewerside | 2007, 2016, 2017, 2021 |
| Sex Waffles | 2022 |
| Shaggy 2 Dope | 2017 |
| Shaggy The Airhead | 2021, 2024 |
| Shakewell | 2019, 2023 |
| Shane Capone | 2008 |
| Shangri-La Soldierz | 2007 |
| Shawn Halpin | 2009 |
| Sherrod Small | 2014 |
Shilow |
2023 |
| Shock G. | 2014 |
Showmegod |
2024 |
| Shy One | 2007, 2008, 2009 |
| SIA (Scrubs in Actions) | 2006 |
| Sid of Slipknot | 2010 |
| Side Weighs | 2021 |
| Sidefect | 2006 |
| SINSIC | 2006 |
| Sir Mix-A-Lot | 2022 |
| Sixx Digit | 2011, 2012, 2013 |
| Sketch | 2012, 2013 |
| Sketchy | 2015 |
| Skitzo | 2014, 2016, 2017, 2019, 2021, 2022 |
| Skrapt Soulz | 2006 |
| Skull Kidz | 2017 |
| Slaine | 2012, 2013 |
| Sleep Tastes Pretty | 2012 |
| Slick Rick | 2016, 2022 |
| Smackola Of Dirty Wormz | 2013 |
Smallz One |
2024 |
| SMD | 2011 |
| Smokehouse Junkiez | 2007, 2008, 2009, 2010, 2011, 2012, 2014 |
| Smokey Rameriz | 2009 |
| Snake iiz | 2015 |
| So High Clique | 2012 |
| So Sick Social Club | 2011, 2012 |
| Soopa Villainz | 2019 |
| Soopa Chillinz | 2006 |
| Soulfly | 2012, 2013 |
| South Park Enterprise | 2013 |
| Southeast Devastation | 2007 |
| Southside Hatchet Swingin' Mob (SHSM) | 2013 |
| Spaide Ripper | 2014, 2016 |
| Spice 1 | 2010 |
Sponge |
2023 |
| SSB | 2017, 2021 |
| SSB & SHSM | 2016 |
| State Of Krisis | 2017 |
| Static X | 2012, 2024 |
| Statik G | 2017 |
| Steel Panther | 2022 |
| Stenjoddi | 2015 |
| Steve Brewer | 2008, 2009 |
| Steve Sabo | 2008 |
| Stevie Stone | 2014 |
| Stitches | 2015 |
| Stitchez | 2007 |
| Stoner Jordan | 2016, 2018 |
| Str8Jaket | 2012, 2015, 2017 |
| Straight Slime | 2008 |
| Stranger Haze | 2009, 2012 |
Sugarhill Gang |
2023 |
| Suicide Silence | 2016 |
| Summoner's Circle | 2019, 2023 |
| Sup3rsayin | 2017 |
| Super Famous Fun Time Guys | 2022, 2024 |
| Super RO | 2019 |
| Super Smash Bros | 2013, 2014 |
| Sutter Kain | 2007 |
| Swag Toof | 2015 |
| Swollen Members | 2009, 2012, 2013 |
| Sylar | 2019 |
