A recent review of the Malagasy Bignoniaceae for the Catalogue of the Vascular Plants of Madagascar has enabled us to discover new species in most genera in the family. We provide the description of two new species of Colea Bojer ex Meisn., a genus endemic to the Malagasy region (C. labatii Callm. & Phillipson, sp. nov and C. unifoliolata Callm. & Phillipson, sp. nov). The new species are provided with illustrations, a discussion of their morphological affinities and a conservation threat analysis based on the IUCN Red List Categories and Criteria.