Loxanthocereus faustianus is a species of Loxanthocereus found in Peru.

[1] It is a cactus with red-orange flowers, and that grows between 40 centimetres (16 in) and 45 centimetres (18 in) tall.

It produces red to brown berries, and medium-sized brown-black seeds.

[2] Plants are found in Lima, Peru in the valleys of Chillón, Rímac and Santa Eulalia at elevations around 1260 meters.