- Joly&Loiret
- JOMAR CORPORATION, SRL
- Jomavir
- JOMINI GRU snc di JOMINI CARLO & FIGLI
- Jonas & Redmann Group GmbH
- Jonas Hansen Furniture
- Jonas Retamal Arquitecto
- Jonathan Adler
- Jonathan Clark Architects
- Jonathan Hendry Architects
- Jonathan Sileoni
- JonathanSabbadini Grafica 3D al servizio dell'architettura
- Jonckheere
- jones | haydu
- Jones Architects Studio
- Jones Lang LaSalle
- Jones Neville
- JongForm
- JongForm