The El Tambor Fault (Spanish: Falla El Tambor) is an inactive dextral oblique thrust fault in the departments of Cauca and Valle del Cauca in Colombia.

The fault has a total length of 117.5 kilometres (73.0 mi) and runs along an average northeast to southwest strike of 026.1 ± 09 to the west of the Western Ranges of the Colombian Andes.

The fault is named after Cerro El Tambor, Timbiquí, Cauca.

The fault displays strong linear topographic features, tectonic control of drainage, and deflected stream channels and was active in the Late Pleistocene or Early Holocene.

[4] Gómez Tapias, Jorge; Montes Ramírez, Nohora E.; Almanza Meléndez, María F.; Alcárcel Gutiérrez, Fernando A.; Madrid Montoya, César A.; Diederix, Hans (2015).