| Anders Vestergaard Nørskov | PhD Student | DTU Compute | |  |
| David Dylan O'Brien-Møller | PhD Student | DTU Aqua | | |
| Adam O'Connell | Postdoc | DTU Chemistry | | |
| Barry O'Neill | Professor | DTU Aqua | +45 35 88 32 59 | |
| Tommy O'Regan | PhD Student | DTU Bioengineering | | |
| Fraser John Wilkinson OBrien | Postdoc | DTU Compute | | |
| Louisa Obari | QA Responsible | DTU Health Tech | +45 51 64 74 89 | |
| Mihaela Cristiana Obirsanu | Project Controller | ADM5 | +45 93 59 68 43 | |
| Katarina Obradovic | PhD Student | DTU Wind | | |
| Christina Odgaard | Administrative Assistant | DTU National Food Institute | +45 35 88 64 21 | |
| Jan Oechsle | Engineer | DTU Space | | |
| Josef Peter Helmut Oehmen | Associate Professor | DTU Construct | +45 45 25 62 50 | |
| Christian Oettinger | PhD Student | DTU Chemistry | | |
| Ditte Offerlin | Secretary | DTU Bioengineering | +45 45 25 26 00 | |
| Susan Anyango Oginah | Postdoc | DTU Sustain | | |
| Bugra Ogla | Postdoc | DTU Chemical Engineering | | |
| Pernille Krogh Ohms | Part-Time Lecturer | DTU Sustain | | |
| Alexander Holm Ohrt | PhD Student | DTU Electro | | |
| Marie Bjerre Ohrt | Hjælpelærer | DTU Engineering Technology | | |
| Jonas Olafsson | Undervisningsassistent | DTU Adgangskursus | | |
| Oli Olason | Hjælpelærer | DTU Management | | |
| Ole Bjerregaard Ole Bjerregaard Rasmussen | Studielektor | DTU Adgangskursus | +45 45 25 56 56 | |
| Nicole Margrethe Bech Oler | Hjælpelærer | DTU Engineering Technology | | |
| Daniel Haugård Olesen | Associate Professor | DTU Space | +45 45 25 97 46 | |
| Lars Olesen | Business Controller | ADM5 | +45 20 68 62 49 | |
| Peder Jørgensgaard Olesen | Postdoc | DTU Construct | | |
| Lars Peter Fabricius Olesen | Senior Laboratory Technician | DTU Biosustain | +45 93 51 11 12 | |
| Hans Jakob Olesen | Biologist | DTU Aqua | +45 21 15 42 53 | |
| Henrik Olesen | Laboratory technician | DTU Physics | +45 46 77 49 31 | |
| Julie Olesen | Biologist | DTU Aqua | +45 93 51 14 84 | |
| Niels Jørgen Olesen | Emeritus | DTU Aqua | +45 29 24 43 10 | |
| Bjarne W. Olesen | Professor emeritus | DTU Sustain | +45 45 25 41 17 | |
| John Forbes Olesen | Emeritus | DTU Construct | | |
| Dorte Olesen | Consultant, PhD, DSc | DTU Compute | +45 45 25 30 89 | |
| Pelle Thonning Olesen | Senior Advisor | DTU National Food Institute | +45 35 88 72 09 | |
| Mathis Olesen | AC-TAP | DTU Aqua | | |
| Maria Bechmann Olesen | Laborant | DTU Health Tech | | |
| Christoffer Roland Olesen | Laborant | DTU Health Tech | | |
| Malthe Kjølhede Ahlmann Olesen | Medhjælper | DTU Civil Engineering | | |
| Ednaldo Thiesen de Oliveira | Ordinary Seaman | DTU Aqua | | |
| Karine Wermelinger de Oliveira | Research Assistant | DTU National Food Institute | +45 50 22 06 50 | |
| Fabricio Oliveira | Associate Professor, Head of Section | DTU Management | | |
| Conrado Marco Olivieri | Assistent | DTU Health Tech | | |
| Joni Sampsa Olavi Ollonen | Postdoc | DTU Construct | | |
| Thomas Olsen | Associate Professor | DTU Physics | +45 26 29 06 41 | |
| Tine Resting Olsen | HR Secretariat Assistant & Course Coordinator | ADM3 | +45 26 81 02 07 | |
| Poul E Holmdahl Olsen | Project Manager, Chief Consultant | DTU Space | +45 45 25 97 12 | |
| Kasper Wibeck Olsen | Timelønnet hjælpelærer | DTU Adgangskursus | +45 20 67 98 02 | |
| Svend K. Olsen | Technical Specialist | DTU Sustain | | |
| Atli Olsen | Industrial Technician | DTU Chemistry | +45 21 79 91 84 | |
| Viktor Emil Olsen | Ingeniørassistent | DTU Physics | | |
| Jens Frederik Olsen | Chefkonsulent | AFRI | +45 93 51 02 55 | |
| Jytte Olsen | Service Employee | DTU Bioengineering | | |
| Ulrik Lund Olsen | Senior Research Engineer | DTU Physics | +45 24 65 51 69 | |
| Ole Kolvig Olsen | Precision Mechanic / Assistant Engineer | DTU Space | +45 45 25 34 64 | |
| Tim Felle Olsen | Postdoc | DTU Construct | | |
| Jan Kent Olsen | Mechanical Engineer | DTU Chemical Engineering | +45 93 51 02 91 | |
| Lone Kirsten Rosenkær Olsen | Head of Purchase, Service and Work Health Safety | DTU Aqua | +45 20 40 22 30 | |
| Ib Steen Olsen | Emeritus | DTU Construct | | |
| Jeppe Olsen | Senior Officer | DTU Aqua | +45 93 51 14 53 | |
| Emma Methner Olsen | Research Assistant | DTU Energy | | |
| Jan Olsen | Craftsman | CAS | +45 40 60 47 33 | |
| Casper Nøhr Olsen | Udvikler | IT Service | | |
| Kenny Falkær Olsen | Industrial PhD | DTU Compute | | |
| Erik Kaimer Olsen | Forskningstekniker | DTU Health Tech | +45 93 51 08 43 | |
| Povl Ole Haarlev Olsen | Engineer | DTU Space | +45 45 25 34 67 | |
| Stig Irving Olsen | Associate Professor | DTU Sustain | +45 45 25 46 68 | |
| Fritze Lilian Olsen | Studielektor, Cand. Brom. | DTU Adgangskursus | +45 35 88 52 58 | |
| Panchale Olsen | Laboratory technician | DTU Health Tech | | |
| Bjarke Tobias Eisensøe Olsen | Researcher | DTU Wind | +45 22 98 76 06 | |
| Emil Vang Olsen | PhD Student | DTU Sustain | | |
| Astrid Aabo Olsen | Research Assistant | DTU Chemistry | | |
| Anders Smærup Olsen | Senior Development Engineer | DTU Wind | +45 93 51 15 33 | |
| William Kristian Pallisgaard Olsen | Postdoc | BRIGHT | +45 30 28 31 03 | |
| Emil Hovgaard Wrona Olsen | Student Assistant | DTU National Food Institute | | |
| Mark Nyholm Olsen | Hjælpelærer | DTU Engineering Technology | | |
| Inge Holkmann Olsen | Head of Administration | DTU Chemistry | +45 93 51 17 14 | |
| Simon Thusgaard Olsen | Guest Student | DTU Aqua | | |
| Peter Lindebark Olsen | IT Supporter | IT Service | +45 35 88 85 04 | |
| Tonny Kiehn Olsen | AV supporter | IT Service | +45 45 25 79 08 | |
| Nils Olsen | Professor and Head of Geomagnetism and Geospace | DTU Space | +45 45 25 97 08 | |
| Mikki Andrup Olsen | IT-supporter | IT Service | | |
| Gerritdina Marieke Olsman | Ph.d.-studerende | DTU Health Tech | | |
| Albert Brincker Olson | PhD Student | DTU Management | | |
| Torben Olsson | Chief Engineer | DTU Aqua | +45 91 37 00 83 | |
| Peter Olsson | Medhjælper | DTU Space | | |
| Mikael Emil Olsson | Research Engineer | DTU Sustain | +45 30 56 98 94 | |
| Emil Lidman Olsson | Researcher | DTU Chemical Engineering | | |
| Henrik (Oluf) Høyer Olufsen | Certified .NET MVC Developer | IT Service | | |
| Oluwadabobomi Grace Oluwadabobomi Grace Davies | PhD Student | DTU Chemical Engineering | +45 91 42 12 98 | |
| Anton Rodbjerg Ommen | LUME /Skylab Startup Program | DTU Skylab | +45 60 83 20 16 | |
| Kuba Oniszk | PhD Student | DTU Space | | |
| Carina Onofrei | Hjælpelærer | DTU Management | | |
| Mía López Portillo Ontiveros | Part time student assistant | BRIGHT | | |
| Joshua Onyango | PhD Student | DTU Chemical Engineering | | |
| Robin van Oorschot | Teaching Associate Professor | DTU Entrepreneurship | +45 45 25 44 16 | |
| Caroline van Oosterhout | Coordinator | DTU Health Tech | +45 45 25 39 50 | |
| Aïda Jiménez Ordoñez | Bachelor | DTU Compute | | |
| Lucas Orellana | Student Assistant | APR | | |
| Esteban Orellana | Postdoc | DTU Sustain | | |