Felsenkirche, Gothic church in Idar-Oberstein, Germany

The Felsenkirche is an evangelical church built into a natural recess in the cliff above Oberstein, a district of Idar-Oberstein. Its white-plastered facade has three tall round-arched windows between plain pilasters; a square tower with a dark pointed spire stands to the left, and a lower annex with a rounded apse to the right. The church rests on a stone base set into the rock.

Wirich IV of Daun-Oberstein had the church built between 1482 and 1484 on the foundations of an older cave castle. Rockfall caused major structural changes in 1742 and 1858, and renovations in 1927–1929 and 1981 altered the interior. From the Reformation until 1964 it served as Oberstein's Protestant parish church.

The name Felsenkirche means "church in the rock". A local legend tells that Wirich of Oberstein threw his brother Emich from Bosselstein Castle over their shared love for Bertha von Lichtenburg, then built a chapel in penance; a spring burst from the rock and still flows. Services, weddings and the Christmas Eve mass are held here, and visits are only possible in guided groups booked through the tourist information office.

The interior is reached through a tunnel blasted into the rock in 1980/81. General visits are only possible in guided groups, arranged in advance through the Tourist-Info; the church is otherwise used for occasional services, weddings and the Christmas Eve mass.

A natural spring flows from the rock inside the church, discovered during the original construction work. According to local story, the water emerged after Wirich's prayer as a sign of his repentance.