| ACT | COUNTRYCNT | EDITIONED | FESTIVALFES |
|---|---|---|---|
| Orange Skyline | NLNetherlands 2015 | | |
| Oratnitza | BGBulgaria 2015 | | |
| ORCHESTRE TOUT PUISSANT MARCEL DUCHAMP | CHSwitzerland 2015 | | |
| Ordure | NLNetherlands 2015 | | |
| Orla Gartland | IEIreland 2015 | | |
| Oscar & the Wolf | BEBelgium 2015 | | |
| Oso Leone | ESSpain 2015 | | |
| Paceshifters | NLNetherlands 2015 | | |
| Palace | GBUnited Kingdom 2015 | | |
| Pandreas | NONorway 2015 | | |
| PAUW | NLNetherlands 2015 | | |
| PHOS | NLNetherlands 2015 | | |
| Pitto | NLNetherlands 2015 | | |
| Playground Zer0 (AAAfterparty) | NLNetherlands 2015 | | |
| Polygrains | GRGreece 2015 | | |
| Pomrad | BEBelgium 2015 | | |
| Posij | NLNetherlands 2015 | | |
| Punčke | HRCroatia 2015 | | |
| Pushin Wood Soundsystem | NLNetherlands 2015 | | |
| Puts Marie | CHSwitzerland 2015 | | |
| Radio Days | NLNetherlands 2015 | | |
| Rae Morris | GBUnited Kingdom 2015 | | |
| Raglans | IEIreland 2015 | | |
| Raketkanon | BEBelgium 2015 | | |
| Rebeka | PLPoland 2015 | | |
| Rimer London (dj-set) | NLNetherlands 2015 | | |
| Robbing Millions | BEBelgium 2015 | | |
| Rökkurró | ISIceland 2015 | | |
| Rondé | NLNetherlands 2015 | | |
| Ronnie Flex | NLNetherlands 2015 | | |
| RUM&SKUNK | NLNetherlands 2015 | | |
| Samaris | ISIceland 2015 | | |
| Santa Fé | NLNetherlands 2015 | | |
| Sarah-Jane | NLNetherlands 2015 | | |
| Sascha Elisah | NLNetherlands 2015 | | |
| SBMG | NLNetherlands 2015 | | |
| Sea Change | NONorway 2015 | | |
| Seinabo Sey | SESweden 2015 | | |
| SEKUOIA | DKDenmark 2015 | | |
| Sevdaliza | NLNetherlands 2015 | | |
| Sexton Creeps | NLNetherlands 2015 | | |
| Shaka Ponk | FRFrance 2015 | | |
| Shannon Saunders | GBUnited Kingdom 2015 | | |
| Shura | GBUnited Kingdom 2015 | | |
| Sisters | IEIreland 2015 | | |
| Skálmöld | ISIceland 2015 | | |
| SKIP&DIE | NLNetherlands 2015 | | |
| Snowapple | NLNetherlands 2015 | | |
| SOAK | IEIreland 2015 | | |
| Sofie Winterson | NLNetherlands 2015 | |