- Jürgen Schwerter
- Jürgen Seybold Sonnenschutz
- Jurginis Project Management Ltd.
- Juri Troy architects
- JUST
- Just an Architect
- Just Naturstein
- Just One Piece srl
- Just Trays
- JustDeco
- JUSTIME
- Justin Van Breda
- Justor - Talleres Trepat S.A.
- Justror - Talleres Trepat, S.A.
- JUSTUS GmbH
- JUTZLER AG
- Juurlink+Geluk architects
- juvant costruzioni srl