- Jan Luppes Interieurs
- Jan Plechác & Henry Wielgus
- JAN RÖSLER ARCHITEKTEN
- Jan Störmer Partners
- JAN VAN BEEK EIGENTIJDS WONEN
- Jan Willem de Laive
- Jana Kitchen srl
- Janas Energia Srl
- Jancuk
- Jane Knapp Ltd.
- Jane Richards Interiors
- Jane Riddell Architects
- Janesville Acoustics
- JANGEORGE INT DESIGN N.Y
- Jangir Maddadi Design Bureau
- JANINE
- Janitza electronics GmbH
- Jankó Ablak
- Jankó Ablak