The Ecemiş Fault is a north-northeast trending left-lateral strike-slip fault running through the Ecemiş valley in central Turkey, between the Aladağlar and Bolkar ranges of the Taurus Mountains near Niğde. It is a principal element of the Central Anatolian Fault Zone that helps take up the westward movement of the Anatolian block.
The fault has a long geological history with tens of kilometres of cumulative left-lateral offset, though its present-day slip rate is low, on the order of a millimetre or so per year. Its trace forms a striking linear valley that channels the Ecemiş River and separates distinct rock terrains.
Instrumental and historical seismicity is moderate rather than dramatic, but the fault is capable of producing damaging earthquakes in a region of growing towns and infrastructure. Its long, well-defined structure makes it an important target for paleoseismic and hazard research in central Anatolia.