(1836) (Basionym) Catasetum deltoideum, the triangular catasetum, is a species of orchid found from Guyana, French Guiana, Suriname and Brazil.

This medium-sized orchid is epiphytic in forest at higher elevations.

It has oblong-fusiform stems (pseudobulbs) carrying deciduous, ridged, many nerved, oblong-lanceolate, acute leaves.

[1] Male flowers resupinate, triangular.

sepals and petals are lanceolate, dark green marked with maroon.