| 24.4.2013 | Oana M. Oprean, Romania’s accession to the European Union and its impact on the Roma minority (Saarbrücken: LAP Lambert Academic Publishing, 2012) | Serban, Henrieta |
| 3.6.2022 | Object EEG response: Recording Human Steady State Visually Evoked Potential for Object Images | Björg Kara Elefsen Ólafsdóttir 1994-; Ísabella Sigurðardóttir 1997-; Lára Margrét Pálsdóttir 1997- |
| 31.5.2019 | The object of my recognition: The role of high-level vision in reading of 4th graders | Logi Úlfarsson 1988- |
| 2.2.2016 | Objective evaluation of lean meat yield and EUROP scores for Icelandic lamb carcasses by video image analysis | Eyþór Einarsson 1976- |
| 2.6.2021 | Objective measures of performance with implications to inform the iterative design process of prosthetic feet | Oliver Daliet 1995- |
| 15.11.2013 | Objects in Space | Heiða María Sigurðardóttir 1982- |
| 17.3.2020 | Obodo snjallsímaforrit : viðskiptaáætlun | Sólveig Valgerður Sveinbjörnsdóttir 1994- |
| 19.6.2025 | OBSCURED BY CLOUDS | Pétur Jónsson 1994- |
| 29.10.2010 | Obscurity as heritage. The Þorrablót revisited | Kristinn Schram |
| 23.6.2022 | Observation - Relation and Exaggeration | Katrín Guðmunds Sigrúnardóttir 1998- |
| 11.11.2025 | Observing Seasonal Cycles in Greenhouse Gas Fluxes with Automatic Flushing Chambers in a Low-Arctic Lake | Celeste Bergne 2001- |
| 6.5.2016 | Obsession in Edgar Allan Poe's Berenice and Ligeia | Sunna Guðný Pálmadóttir 1975- |
| 24.6.2020 | Obstructive sleep apnea and snoring in Icelandic children : the five-to-fifteen questionnaire and school performance | Carmen Maja Valencia 1988- |
| 21.10.2024 | Obstructive Sleep Apnea: Prevalence among 4-9 year old Children in the General Population and Connection with Overweight/Obesity | Ingibjörg Ösp Ingólfsdóttir 1980- |
| 9.8.2017 | Occupational stress among caregivers in the geriatric care field in Iceland : relations with sickness absenteeism, anxiety, and depression symptoms | Valdís Jónsdóttir 1993- |
| 23.9.2021 | Occupational stress and remedies amongst supermarket employees during COVID-19 | Nicoló Secondo Rech 1996- |
| 11.6.2015 | Occurrence graphs of patterns in permutations | Bjarni Jens Kristinsson 1991- |
| 7.6.2011 | Occurrence of different persistent organic pollutants in Atlantic cod (Gadus morhua L.) in Icelandic waters | Vordís Baldursdóttir |
| 25.2.2020 | Occurrence, prevalence, and classification of fishing related marine debris in Iceland’s Westfjords | O'Rourke, Amy, 1995- |
| 27.1.2023 | The Oceanic Gaze | Isabelle Jean Knickle Riche 1997- |
| 16.4.2021 | Oda Nobunaga: The Ruthless Warlord | Gunnar Rúnar Sigurþórsson 1987- |
| 13.6.2012 | Oddeyri and its image : where does the image come from and where can it be seen? | Herdís Helgadóttir 1990- |
| 11.1.2024 | Oddfellowhús í Urriðaholti : Vinastræti 30, 210 Garðabær | Bryndís Elva Kjartansdóttir 1991- |
| 17.5.2011 | Oddgeir Kristjánsson : þróun tónsmíða hans í samhengi við Þjóðhátíð Vestmannaeyja og lífshlaup hans | Hafsteinn Þórólfsson 1977- |
| 23.6.2022 | An Odyssey of Dreams and Memories | Elnaz Mansouri 1991- |