Tibouchina nigricans is a species of flowering plant in the family Melastomataceae, native to west-central Brazil.

[3] Tibouchina nigricans is a short, unbranched shrub with a dark purple hypanthium and calyx lobes.

T. nigricans is similar to T. aegopogon and T. johnwurdackiana as these species each have only a single stem, although there are distinguishing differences in the trichomes and indumentum of the leaves and hypanthium.

It prefers open grassland including the campo sujo and cerrado rupestre.

It has recently been found in Parque Nacional de Brasília and Serra dos Pireneus.