Burg Rosenegg, Medieval hilltop castle ruins in Hegau, Germany.

Burg Rosenegg is the ruin of a medieval hilltop castle on a conical hill at 538 m above sea level on the northern slope of the Rosenegg, directly behind the Berggasthof Burg Rosenegg in Rielasingen-Worblingen. Surviving are extensive wall remains, including sections of rough grey and brown masonry, and the site of a bergfried with a 6.5 by 6.5 metre base and walls 1.5 metres thick.

Burg Rosenegg was probably built in the first half of the 13th century, possibly by the Lords of Twiel, and is documented in 1250 as held by the Lords of Rosenegg. In 1335 it passed to the Lords of Lupfen; after destruction in the Swiss War of 1499 it was rebuilt, and on the family's extinction in 1610 it went to the Bishopric of Constance. Expanded in 1617 as a secondary residence with raised living quarters, it was occupied by Württemberg troops in 1632 and destroyed in 1639 by troops from Hohentwiel; the ruin was demolished at the end of the 17th century.

The name Rosenegg comes from the noble family first recorded here in 1250. The ruin stands directly behind the Berggasthof Burg Rosenegg, and the short climb from the inn to the walls is a local outing. The grassy slope below the masonry is grazed and mown, keeping the wall visible from the valley.

The ruin sits on a 538 m hill cone directly behind the Berggasthof Burg Rosenegg in Rielasingen-Worblingen. The approach is on foot from the inn; the surviving masonry lies close to the building, so the walk is short but the ground is uneven. Sturdy shoes help on the rough grass and loose stone.

The bergfried measured 6.5 by 6.5 metres in plan, with walls 1.5 metres thick. The castle was destroyed in 1639 by troops from Hohentwiel, and the ruin was demolished at the end of the 17th century; the surviving stretches of masonry are what remain of that tower and its enclosure.