Finn person fra Lørenskog
- Øivind Olsen
- Roger Olsen-Rusten
- Bernadeth Cielo Olsson
- Fredrik Olsson
- Hasse Ingolf Olsson
- Per Jonas Olsson
- Sølvi Olsson
- Veronica Olsson
- Michelle Olstad
- Ulla Brit Bakke Olstad
- Christian Otto Olsvik
- Nikolai Olsvik
- Nina Olsvik
- Tomasz Olszewski
- Lise Olufsen
- Hildegunn Oma
- Mirsada Omanovic
- Hussein Abdi Omar
- Cris Maggie Ombajin
- Houzhin Omer
- Rosmarie Omholt
- Else Olea Omland
- Om Prakash Sigdel
- Solveig Jalgard Omsted
- Camilla Onstad
- Eivind Onsum
- Linda Ellingsen Onsum
- Wisdom Ugochukwu Onu
- Dawid Opalka
- Anders Opdal
- Beate Opgård
- Brit Buvarp Opheim
- Lisbeth Bahr Opheim
- Ove Opheim
- Sigrun Opheim
- Kjersti Opheim Myrseth
- Malin Opland
- Boye Opoku
- Christine Oppegaard
- Ingrid Oppegaard
- Marianne Oppegaard
- Ann-Marie Oppegaard i
- Ane Oppegård Østenengen
- Elin Opphaug
- Georgiana Adriana Oprea
- Anne Opsahl
- Carl Erik Opsahl
- Hege-Marie Opsahl
- Julian Helgesen Opsahl
- Trond Opsahl
- Yvonne Opsahl
- Thea Eline Martens Opås
- Torill Ora
- El Houssain Orahhou
- Yousra Orahhou
- Rolf Ormstad
- Elisabeth Martha Ortega
- Pinar Oruc
- Arkadiusz Orzechowski
- Elin Krogh Osa
- Eirik Nicolai O Oseberg
- Kjell Erik Ottesen Oseberg
- Kjell Erik Oseberg
- Monica Ottesen Oseberg
- Mona Osflaten
- Stian Osflaten
- Mari Oshaug
- Ifeoma Osimili
- Amira Mustafa Osman
- Mohammed Osman
- Adnana Osmanbasic
- Leotrim Osmani
- Nadiia Ostapenko
- John Ostrander
- Marcel Ostrowski
- Christopher Osuman
- Calin Osvoll
- Fredy tidl. Freddy Otten Otén
- Bente Otervik
- Eddie Otervik
- Henrik Otervik
- Sara Hazem Othman Ali
- Sirin Hazem Othman Ali
- Anina Otnes
- Eva Jeanette Otnes
- Inga Otnes
- Peder Otnes
- Tonje Otnes
- Fredrik Ottem
- Jan Henrik Ottem
- Vemund Otten
- Kjell Otterlei
- Terje Otterlei
- Terje Otterstad
- Christian Ottesen
- Herman Ottesen
- Linda Ottesen
- Ann Kristin Ottosen
- Jan Ottten
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