Seibersdorf is an Austrian market town with 1,283 residents in the District of Baden in Lower Austria.
Seibersdorf lies in the industrial belt of Lower Austria. The municipality has an area of 20.2 km², 9.36 percent of which is forested.
Seibersdorf contains the following districts: Deutsch-Brodersdorf, Seibersdorf.
In antiquity, the area was part of the Roman province of Pannonia. Located in the Austrian heartland, Lower Austria played a key part in much of Austrian history.
Seibersdorf is best known as the home of Austrian Research Centers now changed to Austrian Institute of Technology AIT. The International Atomic Energy Agency also operates laboratories within the same premises.