The Guáitara Fault (Spanish: Falla de Guáitara) is a dextral strike-slip fault in the department of Nariño in southwestern Colombia.

The fault has a total length of 36.1 kilometres (22.4 mi) and runs along an average northeast to the southwest strike of 044.1 ± 4 in the Western Ranges of the Colombian Andes.

[1] The Guáitara Fault is in the Nariño Department of southwestern Colombia, crossing the Western Ranges of the Colombian Andes and to the south of the city of Pasto.

The fault forms well-developed deep V-shaped valleys, linear topographic features, fault-controlled drainage, deflected streams, and elongated hills.

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