The Rosas-Julumito Fault () is an oblique dextral strike-slip fault in the department of Cauca in southwestern Colombia. The fault is part of the megaregional Romeral Fault System and has a total length of and runs along an average northeast to southwest strike of 026.9 ± 7 in the Central Ranges of the Colombian Andes. The fault is associated with the 1983 Popayán earthquake that partially destroyed Popayán, the capital of Cauca, and led to more than 300 fatalities. A maximum moment magnitude earthquake of 6.8 is estimated for the fault.