Firma J - Hakadal
- Jonas Giacius
- Johnny Pedersen
- Johansen Infotech
- Jensen Morten
- Jaktslottet Raasjøen
- Jonathan Holding AS
- Jelika Poolsawad
- Jk Gullbergs Murerfirma
- Joakim Magnus Taraldsen
- Jon Boye Larsen
- Jozsef Adam Toth
- Johnsen & Stovner AS
- Julie Elisabeth Karlsen
- Jo-Inge Rokne
- Jörmungandr Viking Lag
- Jörmungandr Viking Lag
- Jan Filipek Dariusz
- John Derek Scrowther
- Jehovas Vitner - Nittedal Menighet
- Jenny-Marie Hjemgaard Wadosch
- Joel Lluis Resina Sánchez
- Janek Montasje Janek Kondra
- Janno Montasje, Janno Reinjarv