Jahn-Kapelle Klein Vielen, Sepulchral chapel in Klein Vielen, Germany.

Jahn-Kapelle Klein Vielen is an octagonal brick structure built as a sepulchral chapel near the Klingenberg area. Its interior features trapezoidal vaults along the sides and a distinctive eight-sided cross vault spanning the central space.

Eduard Rudolph Jahn (1816–1890), owner of the Klein Vielen estate, had the chapel built from 1851 in memory of his deceased wife and daughter. The design is attributed to Friedrich Wilhelm Buttel, a pupil of Karl Friedrich Schinkel. After the manor house burned down in 1947, the chapel fell into decay; restoration began in 2016 and was largely completed by 2022.

The chapel is a family grave for the Jahn family, who owned the Klein Vielen estate. The family vaults regained their historic enclosure in 2023. Since 2009 a support association and the local cultural club have worked to keep the building open for cultural and tourist use, under the motto "A belvedere between Lieps and Havel spring".

The chapel stands on the Klingenberg, separated from the surrounding land by a fieldstone wall, and a spiral path leads up to it. The park-like grounds on the hill are being restored step by step, with first work carried out in spring 2019. The site is reached on foot over natural terrain.

The three-part upper windows of the octagon keep their original tracery made of shaped bricks; the tracery in the side aisles was reconstructed during restoration. The chapel's design is attributed to Friedrich Wilhelm Buttel, a pupil of Karl Friedrich Schinkel, and its window tracery recalls the neo-Gothic tower of the Marienkirche in Neubrandenburg.