| ACT | COUNTRYCNT | EDITIONED | FESTIVALFES |
|---|---|---|---|
| Ocean Wisdom | GBUnited Kingdom 2019 | | |
| Octavian | GBUnited Kingdom 2019 | | |
| Odd Beholder | CHSwitzerland 2019 | | |
| Oes | NLNetherlands 2019 | | |
| O GAJO | PTPortugal 2019 | | |
| Ondt Blod | NONorway 2019 | | |
| Onhou | NLNetherlands 2019 | | |
| Onipa | GBUnited Kingdom 2019 | | |
| OOO | NLNetherlands 2019 | | |
| Our Stories | SKSlovakia 2019 | | |
| Odina | ESSpain 2018 | | |
| Off Bloom | DKDenmark 2018 | | |
| OMIRI | PTPortugal 2018 | | |
| One Sentence. Supervisor | CHSwitzerland 2018 | | |
| Octa Push | PTPortugal 2017 | | |
| OLDE GODS | ESSpain 2017 | | |
| Onuka | UAUkraine 2017 | | |
| Orange Skyline | NLNetherlands 2017 | | |
| Ortega | NLNetherlands 2017 | | |
| Otzeki | GBUnited Kingdom 2017 | | |
| Oaktree | BEBelgium 2016 | | |
| Ocellot | ESSpain 2016 | | |
| Ocho Macho | HUHungary 2016 | | |
| OIJ | NLNetherlands 2016 | | |
| OKAY KAYA | NONorway 2016 | | |
| Orange Skyline | NLNetherlands 2016 | | |
| OSCAR | GBUnited Kingdom 2016 | | |
| Oscar and The Wolf | BEBelgium 2016 | | |
| OTHERKIN | IEIreland 2016 | | |
| Óbó | ISIceland 2015 | | |
| Odd Hugo | EEEstonia 2015 | | |
| Oes | NLNetherlands 2015 | | |
| Ogris Debris | ATAustria 2015 | | |
| O. J. Band | BGBulgaria 2015 | | |
| 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 | | |
| Okta Logue | DEGermany 2014 | | |
| Orange Skyline | NLNetherlands 2014 | | |
| OWLLE | FRFrance 2014 | | |
| Oyama | ISIceland 2014 | | |
| O-Bat & the Undead | NLNetherlands 2013 | | |
| Orange Skyline | NLNetherlands 2013 | | |
| Orelha Negra | PTPortugal 2013 | | |
| Orgel Vreten | NLNetherlands 2013 | | |
| Ortega | NLNetherlands 2013 | |