Finn person fra Sinsen
- Tony Okoro
- Damian Okrutny
- Essayas Okubazi
- Hanna Olberg
- Stein Olberg
- Synnøve Olberg
- Patryk Kazimierz Olejnik
- Kaja Moen Olgyai
- Atle Halfdan Olsen
- Dennis Alexander Olsen
- Eirin Olsen
- Elisabeth Helene Olsen
- Espen Andre Olsen
- Gard Olsen
- Kai Arne Olsen
- Kristian Mareno Matre Olsen
- Martine Elisabet Mohedano Olsen
- Patrik Storm Olsen
- Roger Olsen
- Sven-Erik Olsen
- Therese Olsen
- Tom Erik Olsen
- Tom Jin Olsen
- Joakim Olsen Husa
- Karoline Olsrød Jørgensen
- Daniel Olsson
- Mats Olsson
- Benedicte Olstad
- Fredrik Olstad
- Ingeborg Olstad
- Mariusz Zbigniew Olsztynski
- Hanad Omar
- Ibrahim Adan Omar
- Jalal Sakar Omar
- Kaire Omar
- Khadar Omar
- Mahmud Omar
- Nesrin Omar
- Omar Nesrin Omar
- Sadiya Omar
- Thanaa Omar
- Omar Omara
- Egon Omark
- Joakim Laurent Omberg
- Andre Haug Omdahl
- Mohamed Omer Alzeber
- Ismailaki Omeri
- Marikken Omvik
- Tuva Onarheim
- Jaana Anni Emilia Onniselkä
- Georg Olav Opdahl
- Lotte Opdal
- Terje Haugland Opdal
- Kjetil Ljung Opedal
- Jon Henrik Opsahl
- Kristina Opsahl
- Isabel Opseth
- Igor Orekhov
- Martine Ore Wormsen
- Afam Orgih
- Therese Normann Orkelbog
- Sebastian Pietschmann Orre
- Sissel Iren Orstein Wiik
- Nils-Hogne Os
- Jeff Osagie
- Austine Reg Osarenkhoe
- Christina Marianne Siqveland Oscar-Andersen
- Joy Osemeghai
- Julius Osemwegie
- August Osestad
- Hilde Osgjerd Rekve
- Kacper Osiej
- Abdelgader Osman
- Abdirisaq Abdullahi Osman
- Ahmad Hadid Osman
- Ali Osman
- Ali Abdullahi Osman
- Ali Mohamed Osman
- Faisal Mohammed Osman
- Fuiso Osman
- Gyulhan Osman
- Hassan Osman
- Hassan Sheik Abdirahim Sheik Osman
- Hussein Osman
- Ibrahim Osman
- Mohammad Ali Osman
- Qasim Osman
- Sait Eshref Osman
- Saud Saleh Mohamed Osman
- Fidan Osmani
- Pia Osmundsen Nilsen
- Kristoffer Tomter Osnes
- Magdalena Ostrowska
- Beate Osvoll Ingvaldsen
- Dijwar Othman
- Egil Otter
- Ben Rabah Ouahid
- Wissal El Ouasdi
- Ghizlane Ouqassou