Alle Firmen mit dem Anfangsbuchstaben D
- Dipl-Ing. Oberwalder Anita
- Dipl-Ing. Oberweger Florian
- Dipl-Ing. Oberzaucher Georg
- Dipl-Ing. Obwegeser-Diem Anna Marlene
- Dipl-Ing. Oitzinger Anton Albert
- Dipl-Ing. Okur Rüstü Süha
- Dipl-Ing. Oliver Stübe
- Dipl-Ing. Olsacher Erich
- Dipl-Ing. Oppitz Albrecht
- Dipl-Ing. Oppitz Marcus Viktor
- Dipl-Ing. Orendi Christian
- Dipl-Ing. Orner Fabian
- Dipl-Ing. Ortner Andreas
- Dipl-Ing. Ortner Friedrich
- Dipl-Ing. Ortner-Kirchler Romana
- Dipl-Ing. Osl Günter
- Dipl-Ing. Oswald Michael
- Dipl-Ing. Ott-Reinisch Irene
- Dipl-Ing. Ottendorfer Andreas
- Dipl-Ing. Otto Bernhard
- Dipl-Ing. Paar Josef
- Dipl-Ing. Pabinger Josef
- Dipl-Ing. Pachinger Franz
- Dipl-Ing. Pachler Ewald
- Dipl-Ing. Pachner Andreas
- Dipl-Ing. Painsi Walter
- Dipl-Ing. Palecek Jacob
- Dipl-Ing. Palfinger Georg Jakob
- Dipl-Ing. Paller Hermann
- Dipl-Ing. Pammer Gernot Siegfried
- Dipl-Ing. Pangerl Peter
- Dipl-Ing. Panzenböck Leonhard Franz
- Dipl-Ing. Paretta Werner
- Dipl-Ing. Parigger Martin
- Dipl-Ing. Parthl Günter
- Dipl-Ing. Partl Manfred
- Dipl-Ing. Past Philipp
- Dipl-Ing. Pavelka Johann
- Dipl-Ing. Payer Wolfgang
- Dipl-Ing. Pazourek Karl
- Dipl-Ing. Peer Maria
- Dipl-Ing. Peherstorfer Katharina Maria
- Dipl-Ing. Pekarek Ludwig
- Dipl-Ing. Pekarek Zuzana
- Dipl-Ing. Pekija Snezana
- Dipl-Ing. Pelinka Olga
- Dipl-Ing. Pellissetti Stefano
- Dipl-Ing. Pendl Georg
- Dipl-Ing. Penz Edmund
- Dipl-Ing. Percht Günther
- Dipl-Ing. Pereira-Arnstein Daniel Alexander
- Dipl-Ing. Peretti Friedrich
- Dipl-Ing. Perndl Claudia Christine
- Dipl-Ing. Peschak Bernhard
- Dipl-Ing. Peter Gehr
- Dipl-Ing. Peter Rene Dietmüller
- Dipl-Ing. Peter Schmid
- Dipl-Ing. Peter Spitzer
- Dipl-Ing. Peter Zaiser
- Dipl-Ing. Petscharnig Florian Ferdinand
- Dipl-Ing. Petschnig Andreas
- Dipl-Ing. Petter Gerald
- Dipl-Ing. Petter Johannes
- Dipl-Ing. Pevetz Dietmar
- Dipl-Ing. Peydl Peter
- Dipl-Ing. Pezeshki Farhad
- Dipl-Ing. Pfandl Erich
- Dipl-Ing. Pfeiller Kurt
- Dipl-Ing. Pfeiller Kurt
- Dipl-Ing. Pfleger Reinhard
- Dipl-Ing. PhD Otter Christian Max
- Dipl-Ing. Piberger Franz
- Dipl-Ing. Pietsch Lorenz Georg Berthold
- Dipl-Ing. Pilsinger Robert
- Dipl-Ing. Pilz Paul
- Dipl-Ing. Pimiskern Johannes
- Dipl-Ing. Pinchasov Ruben
- Dipl-Ing. Pineker Wolfgang
- Dipl-Ing. Pinter Erik
- Dipl-Ing. Pinter Gottfried