Buschberg, Mountain summit in Leiser Berge Nature Park, Lower Austria

Buschberg is the highest summit of the Leiser Berge and of the Weinviertel, reaching 491 m above sea level. Its main plateau holds a cross and the nearly 40 m radome tower of Austro Control's civil air-traffic radar; the Buschberghütte, at 484 m the lowest hut of the Austrian Alpine Club, stands near the top. The southern forepeak, a medieval fortified hilltop cut into a 5–8 m oval cone with a 24 by 9 m platform, is known locally as Simperlberg or Schwedenschanze.

Archaeological finds show early settlement around the Buschberg, including a Roman house believed to have been built by Romans for a Germanic occupant, since the area lay north of the Danube limes. On the 485 m southern spur in Niederleis, a medieval fortified hilltop platform about 24 by 9 m was cut from the ridge, with a surviving step for a walkway and a surrounding rampart; locals call it Simperlberg or Schwedenschanze, possibly reused as a watch post during the Swedish invasion of 1645.

The name Buschberg comes from the Old High German "pusk", meaning a bulge, referring to the hill's rounded shape rather than to brushwood. The southern pre-summit, a medieval fortified mound cut off by a ditch, is known locally as "Simperlberg" and "Schwedenschanze"; it may have served as a lookout during the Swedish invasion of 1645.

The Buschberghütte near the summit, at 484 m the lowest hut of the Austrian Alpine Club, is reached via the Weinviertelweg 632 long-distance trail and the Jakobsweg Weinviertel pilgrim route. The summit plateau with its cross and the Austro Control radar tower is open ground; the prehistoric ring wall surrounds the western summit, which has the widest view.

The name Buschberg does not come from bushes: it derives from Old High German "pusk", meaning a bulge, after the rounded shape that sets it apart from neighbouring hills. The southern pre-summit, a 485 m cone cut off by a trench, carries a medieval ringwork known locally as "Simperlberg" or "Schwedenschanze".