Bedrift J - Ulefoss
- Jabar AS
- Jernbygg AS
- Jegerservice AS
- Jmb Restaurering DA
- John Haatveit
- Jemo Invest AS
- Jörg Becker
- Justyna Ujazda
- Juels Skogforvaltning
- Jan Morten Berglie
- Jens Kristian Herregården
- Jørn Carel Flatland
- Jensen Regnskap Dødsbo
- Johre Kristian Doksrød
- John Magnus Brady
- Jan Arne Sannes
- Jan Erik Næset
- Johansen Rep & Montasje
- Jossis Pt - Jostein Lauvrak Dorholt