Burg Neuenahr, Medieval castle in Bad Neuenahr, Germany.

Burg Neuenahr is a ruined hilltop castle at 337 m on the Neuenahrer Berg above the lower Ahrtal in Bad Neuenahr-Ahrweiler. Remains include the foundations of a triangular perimeter wall, a rectangular central tower and other building traces. A deep neck ditch still reaches 10 m in places, flanked by two large spoil heaps. A round steel-concrete viewing tower was built on the site in 1972.

Count Otto von Neuenare, son of Gerhard von Are und Nürburg, built the castle around 1225 as the seat of the county of Neuenahr; he was the first to take his name from it. In 1372 Archbishop Friedrich III von Saarwerden of Cologne besieged and destroyed it with the help of Ahrweiler's citizen militia to end the robber-knight raids launched from it. The archbishop then forbade any new castle on the hill, and at the end of the 17th century the ruins were quarried away, their stone used among other things for the Rentmeisterei building, today's Beethovenhaus, at the foot of the hill.

The name Neuenahr comes from Count Otto, who around 1225 was the first to call himself after the new castle. The site is linked to the legend "Die Luftbrücke", recorded by Ludwig Bechstein. Since 1972 a round steel-concrete viewing tower has stood on the grounds, next to a modern pavilion of the Eifelverein sheltering hikers.

The castle can be reached from Bad Neuenahr via marked hiking trails from the town center and nearby transport stations. It is advisable to wear sturdy footwear and allow time for the climb to the elevated location.

The demolition material from the ruins was reused: in the late 17th century the stones went largely into the new building of the Rentmeisterei, today's Beethovenhaus, at the foot of the castle hill. Two large spoil heaps of smaller rubble still stand beside the neck ditch.