Biedermannsdorf (German pronunciation: [ˈbiːdɐmansˌdɔʁf] ⓘ; Central Bavarian: Biedamaunsduaf) is a town in the district of Mödling in the Austrian state of Lower Austria.

The Laxenburg-Biedermannsdorf train station lies on the south side of the municipality, and the Vienna–Pottendorf–Neustadt line runs through the east end.

The first mention of the place in historical records dates from 1170/80, at which time it belonged to the Liechtenstein and Perchtoldsdorf families.

Like all municipalities in the area, Biedermannsdorf suffered under the wars of religion, the Turkish occupation, and the plague.

The area was bombed in World War II because the Ostmark airplane factory was nearby.