The Oberkirche (, "Upper Church"), also ("Church of Our Lady by the mountain") or ("Mountain Church"), in Bad Frankenhausen, Thuringia, Germany, is a Gothic church building. Its leaning tower has the largest overhang of all German towers at to north-east and is a landmark of the town.
Due to gypsum and salt leaching in the lower-lying soil, the top of the approximately church tower, which has a Baroque dome with two lanterns, was tilted from the vertical (equivalent to 4.93ð) in 2013. This makes the tower one of the most crooked towers in Germany. Measured by the overhang (deviation of the top of the tower from the perpendicular), it has the highest value of all German towers. It is more inclined than the Leaning Tower of Pisa which had an inclination of 3.97ð in 2011.