Curcuma diversicolor Soonthornk., a new species of subgen. Curcuma (Zingiberaceae, Zingiberoideae) from northern Thailand, is described and illustrated. It differs from its morphologically closest species C. globulifera by e.g. having larger flowers and the presence of coma bracts. Detailed descriptions based on living flowering material, images, and notes on distribution, habitat, and phenology are provided. Its conservation status is provisionally assessed as Data Deficient (DD). n addition, notes are provided on the distribution of the recently described C. sirirugsae, and its conservation status is reassessed based on new collections.