Mirabella albicaulis, synonym Cereus albicaulis, is a species of flowering plant in the family Cactaceae, native to Northeast and Southeast Brazil. It was first described by Britton and Rose in 1920 as Acanthocereus albicaulis.
Mirabella albicaulis grows as a shrub, with only slightly branched, initially upright, later overhanging and spreading to climbing shoots. The elongated, bluish-white, four-edged shoots have a diameter of 1 to 3 centimeters. There are four sharp-edged, only slightly wavy ribs. The small areoles are brown. The two to six unequal, needle-like spines are brown, swollen at their base and up to 2 centimeters long.
The flowers are white, the elongated, somewhat angular fruits are greyish-purple.
Mirabella albicaulis is distributed in the Brazilian state of Bahia.
The first description as Acanthocereus albicaulis was published in 1920 by Nathaniel Lord Britton and Joseph Nelson Rose.
In the IUCN Red List of Threatened Species, the species is listed as "Least Concern (LC)"