| ACT | COUNTRYCNT | EDITIONED | FESTIVALFES |
|---|---|---|---|
| Ocean Wisdom | GBUnited Kingdom 2019 | | |
| O GAJO | PTPortugal 2019 | | |
| Onipa | GBUnited Kingdom 2019 | | |
| Odina | ESSpain 2018 | | |
| Off Bloom | DKDenmark 2018 | | |
| One Sentence. Supervisor | CHSwitzerland 2018 | | |
| Octa Push | PTPortugal 2017 | | |
| OLDE GODS | ESSpain 2017 | | |
| OKAY KAYA | NONorway 2016 | | |
| Oscar and The Wolf | BEBelgium 2016 | | |
| OTHERKIN | IEIreland 2016 | | |
| Óbó | ISIceland 2015 | | |
| Odd Hugo | EEEstonia 2015 | | |
| Oes | NLNetherlands 2015 | | |
| Orange Skyline | NLNetherlands 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 | | |
| Orelha Negra | PTPortugal 2013 | | |
| Orgel Vreten | NLNetherlands 2013 | | |
| Old Jerusalem | PTPortugal 2012 | | |
| Oceana Company | NLNetherlands 2010 | | |
| Oh No Ono | DKDenmark 2007 | | |
| Oszibarack | PLPoland 2006 | | |
| Orange Glow | NLNetherlands 2005 | |