Haageocereus is a genus of cacti endemic to the lower elevations of the extremely dry desert along the coast of Peru and northern Chile.

The species of the genus Haageocereus grow like a shrub to tree-like, with outstretched and creeping, lengthwise, ascending or upright shoots.

The shoots usually consist of many ribs, with closely spaced areoles from which numerous thorns arise.

The fleshy, spherical fruits are green to red and have a few scales and hairs.

The egg-shaped seeds are shiny black and irregularly pitted.