Alle Firmen mit dem Anfangsbuchstaben I
- Ing. Lindmayr Markus
- Ing. Lindner Bernhard
- Ing. Lindner Mathias
- Ing. Lindorfer Christian
- Ing. Lindtner Johannes
- Ing. Linner Manuel Marcello
- ING. LINSBAUER e.U.
- Ing. Linzner David Martin
- Ing. Lippitz Günther
- Ing. List Florian Gerhard
- Ing. Litsch Gernot
- Ing. Litzlbauer David Rupert
- Ing. Lobmaier Gottfried
- Ing. Lobont Admir
- Ing. Lochner Martina
- Ing. Loibner Hans Benedikt
- Ing. Loidol Wilfried
- Ing. Lomosits Bernd
- Ing. Longin Michael A.
- Ing. Lorenz Brigitte
- Ing. Lorenz Gebhard
- Ing. Lorenz Lukas
- Ing. Lorenz Reinhard
- Ing. Lorinc Stefan
- Ing. Loschan Barbara
- Ing. Lothaller Herbert
- Ing. Luchies Jantje Hendrikje
- Ing. Luckabauer Martin
- Ing. Luckabauer Martin
- Ing. Luftensteiner Andreas
- Ing. Luger Wolfgang
- Ing. Lugschitz Herbert
- Ing. Luick Forella Michaela Wilhelmine
- Ing. Luif Martin Horst
- Ing. Lukas Neuwirth e.U.
- Ing. Luke Gernot
- Ing. Lukschander Kurt
- Ing. Lumbe Markus
- Ing. Lunak Lukas
- Ing. Lunglmayr Christian
- Ing. Luntzer Dominik
- Ing. Luppi-Werner Claudia
- Ing. Luschin Wolfgang
- Ing. Luttinger Johann Adalbert
- Ing. Lutz Andreas
- Ing. Lutz Florian
- Ing. Löbl Norbert
- Ing. Löffelberger Markus
- Ing. Löffelmann Wolfgang
- Ing. Löffler Bernhard
- Ing. Löffler Gerald
- Ing. Löw Alexander
- Ing. M. ENZI OEG
- Ing. M. Katzbeck - Elektroinstallationen
- Ing. M. Michalitsch GmbH
- Ing. MA Ehrenstrasser Konrad Franz
- Ing. MA Frühwirth Viktoria Barbara Josefine
- Ing. MA Geyer Sebastian
- Ing. MA Mayr Karina Maria
- Ing. MA MSc Reinprecht Markus Karl
- Ing. MA Schaller Andrea
- Ing. MA Sedlaczek David
- Ing. Macak Daniel
- Ing. Machanec Dalibor
- Ing. Macho Günther
- Ing. Mack Berndt
- Ing. Mader Erich
- Ing. Mader Herbert
- Ing. Mader Peter
- Ing. Madlener Pascal
- Ing. Madler Michael
- Ing. Mag. (FH) Blaßnig Christian
- Ing. Mag. (FH) Eder Isabella Veronika
- Ing. Mag. (FH) Gratzer Alexander Clemens
- Ing. Mag. (FH) Greiner David
- Ing. Mag. (FH) Guggenberger Hannes
- Ing. Mag. (FH) Jabri Nasr
- Ing. Mag. (FH) Kaltenbrunner Ingeborg
- Ing. Mag. (FH) Kandler Robert Matthias
- Ing. Mag. (FH) Löscher Reinhard Johann