Alle Firmen mit dem Anfangsbuchstaben I
- Ing. Nemes Thomas
- Ing. Nemeth Gesellschaft m.b.H & Co KG
- Ing. Nemeth Wolfgang Michael
- Ing. Nemetz Georg Ernst Oskar Werner
- Ing. Nestler Baumaschinen GmbH
- Ing. Netroufal Norbert
- Ing. Netzer Guntram
- Ing. Neubacher Andreas
- Ing. Neuer Günther
- Ing. Neugebauer Helmuth
- Ing. Neuhauser Hubert
- Ing. Neuhauser Sandra
- Ing. Neuhold Dominik
- Ing. Neulinger Mario
- Ing. Neumann Lydia
- Ing. Neumann Michael Alexander
- Ing. Neumayer Josef
- Ing. Neumeister Stefan
- Ing. Neumüller Franz
- Ing. Neusser Harald
- Ing. Nick Thomas
- Ing. Nickmann Robert
- Ing. Niederer Georg Adolf
- Ing. Niederhauser Ronald Adolf
- Ing. Niedermeyer Werner
- Ing. Nieschlag Robert
- Ing. Niesner Oliver
- Ing. Nikola Tomic e.U.
- Ing. Nikolay August Christian
- Ing. Nindl Bernhard
- Ing. Nini Stefan Erwin
- Ing. Nischelwitzer Andreas Christian
- Ing. Nittmann Martin Josef
- Ing. Noichl Wolfgang
- Ing. Noori Khadjavi Jahangir
- Ing. Norbert Lilg e.U. Totalbau- unternehmen
- Ing. Norbert Rieser GesmbH & Co KG
- Ing. Norbert Wondrak GmbH
- Ing. Nothdurfter Christoph
- Ing. Novak Joachim
- Ing. Novi Andreas Walter
- Ing. Novotny Felix
- Ing. Novy Stefan
- Ing. Nowotny Kurt
- Ing. Nuhsbaumer Florian
- Ing. Nöckl Bernhard
- Ing. Nöhrer Werner
- Ing. Oberhauser Jürgen
- Ing. Oberhauser Mathias
- Ing. Oberhoffner Wolfgang
- Ing. Oberle Alexander
- Ing. Oberlechner Gebhard Joachim
- Ing. Obermoser Christoph
- Ing. Obernberger Stefan Günter
- Ing. Oberreiner Stefan Wilfried
- Ing. Oberrisser Klaus
- Ing. Oblak Christoph
- Ing. Obretkovic Milan
- Ing. Ochsenhofer Karl
- Ing. Odziomkova Kristina
- Ing. Oegger Wolfgang
- Ing. Offner Stefan
- Ing. Offner Wilfried
- Ing. Ofner Werner Peter
- Ing. Ofner-Ressler ,MSc Lukas
- Ing. Ogris Walter
- Ing. Oliver Pertl Projektentwicklung & Immobilien
- Ing. Olivia Drexler Planungs- und Baustellenkoordination GmbH
- Ing. Olson Anita
- Ing. Ondracek Heinz Franz
- Ing. Oppel-Straka Romana
- Ing. Oppitz Klemens
- Ing. Ornig Sarina
- Ing. Orsolic Antun
- Ing. Ortbauer Herbert
- Ing. Ortner Ludwig
- Ing. Ortner Markus Heinz
- Ing. Oruc Adis
- Ing. Oskar Kauffert Handel e.U.
- Ing. Osterauer Martin