Brenntenriegel, Mountain summit in Sieggraben, Austria.

Brenntenriegel is a mountain summit in Sieggraben reaching 606 meters elevation and representing the highest point of the Ödenburger Gebirge range in Burgenland. The peak is dominated by telecommunication infrastructure that serves internet and broadcast signals to surrounding communities.

Brenntenriegel is the highest elevation of the Ödenburger Gebirge at 606 m, lying about one kilometre northeast of Sieggraben. Geologically it is built from the Brennberger Blockstrom, a deposit of quartzite and granite-gneiss boulders up to a cubic metre in size in a sandy-silty matrix, carried from the nearby Rosaliengebirge. A roughly 40-metre-high BEWAG transmission facility stands on the summit, and a small private observatory was built there because the mountain is well suited to astronomical observation.

The mountain's name appears in Hungarian as Bren-tető, reflecting the bilingual Burgenland setting near Sieggraben. Its southern and eastern slopes are worked as Streuobstwiesen, traditional scattered fruit orchards, a land use a walker passes directly on the way up.

The summit can be reached via various paths from the surrounding area, with forested northern and western slopes offering manageable hiking routes. The southern and eastern sides feature orchards that provide alternate access routes and scenic walking options for visitors.

The mountain is built of the Brennberg block stream, a deposit of quartzite and granite-gneiss boulders up to a cubic metre in size, set in a sandy-silty matrix washed down from the nearby Rosaliengebirge. The material is visible in the slopes around the summit.