The Carrascoy Fault is a northeast-southwest fault about 30 kilometres long bordering the Sierra de Carrascoy just south of the city of Murcia in southeastern Spain. It is a component of the Eastern Betic Shear Zone and helps raise the mountain range against the flat, densely settled Guadalentín and Segura lowlands.
Its movement mixes left-lateral strike-slip with reverse thrusting, uplifting the sierra while accumulating strain at low rates typical of the region. Paleoseismic trenches reveal repeated surface-rupturing earthquakes, marking it as a mature, seismogenic structure right beside a major population centre.
The fault has not ruptured in a large historical earthquake, but its proximity to Murcia and Alcantarilla makes even a moderate event a serious concern, as the deadly 2011 Lorca quake nearby demonstrated. Hazard studies treat Carrascoy as one of the region's most significant capable faults.