Finn person fra Ås
- Marta Ohma
- Danayi Mahari Okbasillassie
- Aaron Okbasillassie
- Maurine Oluchukwu Okolie
- Torbjørn Okstad
- Olutomi Samuel Okubadejo
- Anita Olaussen
- Cecilie Olaussen
- Gerd Karin Olaussen
- Hans Olaussen
- Kristin Strand Olaussen
- Lill Karin Fjeldheim Olaussen
- Sven Olaussen
- Ellen Solstad Olavesen
- Barbara Olech
- Tina Olguin
- Frøydis Emilia Olhans
- Kristina Elisabet Olhans
- Aksel Smith Olsen
- Anastasia Olsen
- Angelina Elise Olsen
- Anita Røkke Olsen
- Anita Margrethe Hovland Olsen
- Anne-Lise Olsen
- Arne Ragnar Olsen
- Bernt Moritz Schmid Olsen
- Birgit Elisabeth Olsen
- Elsa Olsen
- Espen Olsen
- Geir Olsen
- Hanne Gro Olsen
- Harry Olsen
- Hilde Kaxrud Olsen
- Inger Merete Olsen
- Ivar Olsen
- Jan Erik Olsen
- Jan Vidar Kaxrud Olsen
- Jonny Olsen
- Jorunn Elisabeth Olsen
- Karin Oliv Olsen
- Kim Olsen
- Kjetil Olsen
- Linda Cecilie Olsen
- Liv Olsen
- Njål Kolberg Olsen
- Nora Høyem Olsen
- Odd-Arne Olsen
- Olaug Olsen
- Per-Kristian Olsen
- Randi-Merethe Olsen
- Rolf Arnt Olsen
- Rune Einander Olsen
- Siri Lie Olsen
- Sten Åge Olsen
- Svein Erik Olsen
- Vegard Høgi Olsen
- Veronika Olsen
- Anne Berit Olsen (K)
- Jan Martin Danielsen Olsen-Berg
- Ranja Olsen Granaas
- Mads Olssen
- Gustaf Mikael Olsson
- Jorge Kenth Tony Olsson
- Jörgen Kenth Tony Olsson
- Lars Arvid Olsson
- Kristin Helen Olsson-Portugais
- Edward Baumann Olstad
- Sverre Olstad
- Abshir Mohamud Omar
- Azad Yosef Omar
- Sadia Yussuf Omar
- Asratomar Omar Suleyman Adam
- Anthony Vicent Omega
- Lars Omejer
- Inger-Lise Omland
- Tahsin Momotaz Onee
- Ogechi Onwueyiagba
- Eira Svendsen Opedal
- Hege Opedal
- Helene Opedal
- Helene Opedal
- Ildrid Opedal
- Bjørn Opem
- Reidar Opem
- Jorun Torbjørg Opheim
- Inger Reidun Opheimsbakken
- Helene Opsahl
- Kirsten Opsahl
- Lars Aksel Opsahl
- Elias Opskar
- Zsolt Orban
- Avnik Orbelians
- Manuel Osvaldo Saez Orellana
- Tsegaye Orgino
- Vytautas Orlauskas
- Evelyn Irene Orlin
- Sandor Orosz
- Jesus Ortiz
- Charles Dicken Oruk