Finn person fra Grorud
- Erik Per Näumann
- S O
- Donnah Akinyi Obera
- Jalal Obied
- Doris Obilie
- Nemanja Obradovic
- Srdjan Obradovic
- Angura Osul Robert Ochieng
- Eva Unni Ockernahl
- Paul Christer Oddvang
- Hanne-Lise Odeke
- Marcus Amujal Ekanya Odeke
- Arbnor Odza
- Nadir Odza
- Eghosa Jane Ogoleh
- Marek Ogonowski
- Comfort Ogudugu
- Firdevs Oguz
- Robert Ohlson
- Bente Ohna
- Frank Enoma Ojo
- Frank Ojo
- Desale Okbastion Tekle
- Ammar Oklah Oklah
- Ikem Okolo
- Anthony Okende Okongo
- Stanley Paschal Okoro
- Juliet Ijeoma Okparaebo
- Theo Chukwuma Okparaebo
- Kirsten Ingvild Svartor Olafsen
- Richard Olaisen Makilla
- Stein Are Olausen
- Anita Terjesen Olcay
- Anita Older
- Joar Oldernes
- Torill Oldernes
- Trine Oldernes
- Olegas Kuseliovas
- Weine Olein
- Patryk Wojciech Olejnik
- Turid Wenche Olesen
- Brandon Nick Tampoco Oller
- Anita Haugstad Ollobiev
- Jan Daniel Henry Olrog
- Ragnhild Kristine Olsborg
- Inger Kirstine Olsbu
- Jorunn Olsby
- Alexander Berg Olsen
- Anne-Maren Olsen
- Arild Olsen
- Bjørn Einar Olsen
- Cathrine Sørli Olsen
- Eivind Olsen
- Emilie Olsen
- Freddy Sigurd Olsen
- Geir Olsen
- Grete Olsen
- Gro Anita Olsen
- Heidi Olsen
- Heidi Anita Olsen
- Ida Kristine Olsen
- Jan Einar Olsen
- Jan Tore Olsen
- Kenneth Olsen
- Marit Olsen
- Mathias Vindorum Olsen
- Mathilde Olsen
- Mats Rosseli Olsen
- Merete Olsen
- Mette Narverud Olsen
- Mette Johanne Olsen
- Mona Olsen
- Monica Olsen
- Morten Olsen
- Remy Alexander Olsen
- Sondre Schou Olsen
- Therese Olsen
- Tommy Høglund Olsen
- Torild Mona Olsen
- Wiebke Andrea Olsen
- Oddrun Olsen-Hanssen
- Maja Storrø Olsrud
- Linn Irene Olsson
- Mats Ingemar Olsson
- Matti Birger Wilhelm Olsson
- Gunn Olstad
- Jenny Kristine Olstad Semmerud
- Bjørne Oma
- Abdi Issa Omar
- Farhan Ahmad Omar
- Haawo Mahamed Omar
- Nimo Omar
- Nimo Mohamed Omar
- Munasuleqo Omar Farah
- Walid Omer
- Dag Ommundsen
- Sedigheh Omrani
- Cecilia Oniovo-Kukor
- Anna Onuoha