Alle Firmen mit dem Anfangsbuchstaben I
- Ing. Dauböck Werner
- Ing. David Philipp
- Ing. DDr. MBA Steinecker Werner
- Ing. De Bettin Padolin Markus
- Ing. De Martino Vincenzo
- Ing. Degele Sepp
- Ing. Degenhart Günter Maria
- Ing. Dellacher-Rieger Wolfgang
- Ing. Demel Alexander
- Ing. Demmelbauer GmbH
- Ing. Denk Joachim Hermann
- Ing. Denkmaier Dominik
- Ing. Derfler Christoph Johannes
- Ing. Derntl Gerhard
- Ing. Desort Roland
- Ing. Detlef Zeller Technisches Büro GmbH
- Ing. Deutner Richard
- Ing. Deutsch Bernhard
- Ing. DI (FH) DI Fauland David
- Ing. DI (FH) Mag. Dr. Krachler Christian
- Ing. Di Battista-Pock Verena Gabriela
- Ing. DI BSc Meister Daniel
- Ing. DI Danner Martin
- Ing. DI Hacker Kerstin Elisabeth
- Ing. DI Joham Mario Michael
- Ing. DI Kracher Hannes
- Ing. DI Sackl Robert
- Ing. DI Sauer Ingo
- Ing. DI Woltsche Martin
- Ing. Diaz Marcos Eduardo
- Ing. Dibiasi Michael
- Ing. Dickbauer Thomas
- Ing. Didio Bernhard
- Ing. Dielacher Markus
- Ing. Diem Ursula Carola
- Ing. Dierer Carina
- Ing. Diesenreither Ewald
- Ing. Dieter Kohler KG
- Ing. Dietl Georg Karl
- Ing. Dietmar Waser GmbH
- Ing. Dietrich Christa
- Ing. Dietrich Gerhard
- Ing. Dietrich Rudolf Franz Karl
- Ing. Dietrich Werner
- Ing. Dietrichstein Daniel
- Ing. Diexer Georg Josef
- Ing. Dijanovic Goran
- Ing. Dillinger Hubert
- 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) 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) Schirnhofer Christian
- Ing. Dipl-Ing. (FH) Verdnik Michael
- Ing. Dipl-Ing. Aldrian Andreas
- Ing. Dipl-Ing. Bahr Robert
- Ing. Dipl-Ing. Bakk. Pomarolli Andreas
- Ing. Dipl-Ing. Binder Bernhard
- Ing. Dipl-Ing. Bleier Thomas
- Ing. Dipl-Ing. Breitenseher Kristian
- Ing. Dipl-Ing. Dr. Erlach Hans
- Ing. Dipl-Ing. Ferencsin-Junick Gunther
- 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. Keuschnigg Elisabeth
- Ing. Dipl-Ing. MSc Aster Maximilian
- Ing. Dipl-Ing. Nöbauer Martin Rudolf
- Ing. Dipl-Ing. Pallausch Harald