Alle Firmen mit dem Anfangsbuchstaben I
- Ing. Dietrich Werner
- Ing. Dijanovic Goran
- Ing. Dingl Paul Reinhard
- Ing. Dinser Georg Sebastian
- Ing. Dipl-Ing. (FH) Bauer Thomas Philipp
- Ing. Dipl-Ing. (FH) Danek Thomas
- Ing. Dipl-Ing. (FH) Ebner Gerald
- Ing. Dipl-Ing. (FH) Emmerstorfer Hubert Ignaz Walter
- Ing. Dipl-Ing. (FH) Hemmer Manfred Herbert
- Ing. Dipl-Ing. (FH) Hupfer Sophie-Therese
- Ing. Dipl-Ing. (FH) Kressnigg Peter Robert
- Ing. Dipl-Ing. (FH) Ledermüller Manfred
- Ing. Dipl-Ing. (FH) MSc Rupp Jürgen Franz
- Ing. Dipl-Ing. (FH) Müller Ronny Ernst
- Ing. Dipl-Ing. (FH) Russ Jürgen Wilhelm Alfred
- Ing. Dipl-Ing. (FH) Verdnik Michael
- Ing. Dipl-Ing. Aldrian Andreas
- Ing. Dipl-Ing. Bahr Robert
- Ing. Dipl-Ing. Bakk. Koutny Reinhard
- Ing. Dipl-Ing. Bakk. Pomarolli Andreas
- Ing. Dipl-Ing. BEd BSc Heuberger Stefan Friedrich
- Ing. Dipl-Ing. Bleier Thomas
- Ing. Dipl-Ing. BSc Bernhardt Christian
- Ing. Dipl-Ing. BSc Galhuber Michael Herbert
- Ing. Dipl-Ing. BSc Kellenz Philipp
- Ing. Dipl-Ing. Galler Manuel
- Ing. Dipl-Ing. Habarda-Bartl Roswitha
- Ing. Dipl-Ing. Haberfellner Walter
- Ing. Dipl-Ing. Hetzer Heinrich
- Ing. Dipl-Ing. Kadletz Christian
- Ing. Dipl-Ing. Kerschner Bakk. Karin
- Ing. Dipl-Ing. MBA Peschek Bernhard Leopold
- Ing. Dipl-Ing. Nöbauer Martin Rudolf
- Ing. Dipl-Ing. Pallausch Harald
- Ing. Dipl-Ing. Pasetzky Gunther Paul
- Ing. Dipl-Ing. Pfusterer Andreas
- Ing. Dipl. Ing. (FH) Ellensohn Andreas
- Ing. Dipl.-Ing. (FH) Helmut Quinz e.U.
- Ing. Distelberger KG
- Ing. Ditzelmüller Stefan Klaus
- Ing. Djikic Robert
- Ing. Djordjevic & Djordjevic Bau GmbH
- Ing. Dobritzhofer Sandra
- Ing. Dobrovnik Thomas Harald
- Ing. Doersieb Peter
- Ing. Dohr Patrick
- Ing. Dolar René
- Ing. Doleschal-Linsbauer Karin
- Ing. Dopplinger Dominic
- Ing. Dorer Matthias Maria Raphael
- Ing. Dorfner Bernhard
- Ing. Dormann Dieter
- Ing. Dorner Kurt
- Ing. Dorner Otmar
- Ing. Dornhecker Peter
- Ing. Dorninger Rene
- Ing. Dorninger Stefan
- Ing. Dott. Atena Andrea
- Ing. Dowitsch Lukas
- Ing. Dr. Amin Mostafa Mahmoud
- Ing. Dr. Anzengruber Hermann
- Ing. Dr. Benes Karl
- Ing. Dr. Birgmayer Peter
- Ing. Dr. Cerny Eva
- Ing. Dr. Christof Walser
- Ing. Dr. Hackl Thomas Ludwig
- Ing. Dr. Hamid Omar
- Ing. Dr. Harjkova Galina
- Ing. Dr. Hernegger Gerald
- Ing. Dr. Janovsky Erich
- Ing. Dr. Korc Filip
- Ing. Dr. Lattermann Robert
- Ing. Dr. Martin Weiss, LL.B. LL.M.
- Ing. Dr. Mergenbaum Michael
- Ing. Dr. Mikura Erik
- Ing. Dr. Mikura Erik
- Ing. Dr. Milchrahm Andreas
- Ing. Dr. März Lothar Hans-Toni
- Ing. Dr. Müller Dirk
- Ing. Dr. Paris Stefania