Teufelsley, Hill in the Eifel near Hönningen, Rhineland-Palatinate, Germany

Teufelsley is a 495.9 m high hill of the Ahr Hills in the East Eifel, rising in the municipalities of Hönningen and Dümpelfeld. Its summit region consists of one of Germany's largest contiguous quartzite blocks, a mass that Gottfried Kinkel described as resembling a shattered castle ruin. The rocky crest was placed under protection as a nature reserve on 4 June 1926.

The mountain takes its name from old local folklore, with legends mentioning fortresses built by supernatural forces. Writer Gottfried Kinkel recorded these stories in his accounts.

The name Teufelsley refers to the devil (Teufel) and a rock (Ley). Gottfried Kinkel recorded the local legend that the devil tried to build a castle here in defiance of God, but a single blow from God's hand shattered it. No historical record or masonry remains of any castle.

Hikers can reach the summit along marked pathways, with a mountain shelter called Teufelsleyhütte available on the eastern side. The peak is accessible by foot for hikers of varying abilities, with multiple routes starting from different trailheads.

The rock's shattered look, as if struck from the east, gave rise to the legend that the devil built a castle here against God; Gottfried Kinkel recorded it. No historical source or building remnant confirms any castle on the summit.