Finn person fra Ensjø
- Tine Nørregaard
- Ingvild Nørstegård
- Magnus Skotte Nørsteng
- Oliver Nicolai Nøvik
- Marianne Naas
- Willy Oaland
- Goran Obad
- Ivan Obrovac
- Ljuba Obrovac
- Ahmed Obsiye
- Atle Oddevald
- Ramin Oddin
- Julie Kristin Oddsett
- May Iren Oddsett
- Nina Katrin Oddsett
- Roger Oddsett
- Siv Oddsett-Feingold
- Jan Thomas Houge Odegard
- Erik Odenmark
- Tage Odland
- Veslemøy Johannesen Odland
- Frank Roger Oen
- Linda Ofori
- Linnea Ofstad
- Morten Ofstad
- Pernille Ofte
- Ida Often
- Kristine Ohma
- Grete Irene Olafsen
- Harry Odd Olafsen
- Marie Tangen Olafsen
- Morten Olav
- Per Olav Kallestad
- Rune Olavsen Søvik
- Dennis Vincent Older
- Per Espen Dagfinrudhagen Olegario
- Helene Olimb
- Hanna Karoline Olofsson
- Agnes Olsen
- Andreas Homb Olsen
- Anita Olsen
- Arild Olsen
- Bjørn Olsen
- Bjørn Asgaut Olsen
- Brith Olsen
- Cathrine Olsen
- Cecilie Olsen
- Christian Garbrandt Olsen
- Dag Olav Olsen
- Daiva Kristine Olsen
- Elisabeth Olsen
- Emil Olsen
- Erik Frank Dahl Olsen
- Eva Olsen
- Harald Olsen
- Jan Ottar Seljebu Olsen
- June Karete Olsen
- Karete Olsen
- Kjetil Olsen
- Kristian Stølevik Olsen
- Line Elisabeth Olsen
- Line Veronica Olsen
- Ludwika Lilia Olsen
- Marianne Olsen
- Marianne Sørensen Olsen
- Ole Einar Olsen
- Patrick Rendal Olsen
- Per Arnfinn Olsen
- Rachel Laugtug Olsen
- Raymond Olsen
- Rolf Helge Olsen
- Suphaphorn Olsen
- Thomas Trygsland Olsen
- Thor Ingar Olsen
- Tom-Marius Olsen
- Tor Olsen
- Vidar Olsen
- Darja Olsevskaja
- Anders Olsson
- Gro Olsson
- Hans Jørgen Olsson
- Jøran Olsson
- Sigurd Magnus Haug Olsson
- Tonje Olstad
- Andreas Olufsen
- Frøydis Lillian Olufsen
- Kasper Olufsen
- Awo Osman Omar
- Ayan Ali Omar
- Ikran Farah Omar
- Mohamed Abdiwali Omar
- Shukri Mohamed Omar
- Hanne Ombudstvedt
- Stian Aasjord Omholt
- Sondre Eide Omland
- Johannes Lien Omma
- Ingunn Onarheim Bernson
- Ellen Ongstad
- Lavender Achieng Onyango