We describe a new species of dwarf chameleon from theBrookesiaminimaspecies group.Brookesiatedisp. n.occurs above 1300 m above sea level on the Marojejy massif in northeastern Madagascar. It is genetically sister toB.peyrierasi, a species occurring in lowlands around the Baie de Antongil, but is genetically strongly divergent from that species in both nuclear (c-mos) and mitochondrial (16S, ND2) genes, and morphologically in its smaller size and distinctly different hemipenis. It is the second species of theB.minimaspecies group from Marojejy National Park, but is not known to occur in syntopy with the other species,B.karchei, due to elevational segregation.