We propose a new natural hybrid between Cohniella cebolleta and C. nuda (Orchidaceae, Oncidiinae) from Santa Marta Colombia: Cohniella × carbonoi Yepes-Rapelo & Cetzal is described and illustrated herein. It is vegetatively similar to C. nuda in the the semi-pendulous plant habit and the length of the leaves, but the flowers have intermediate characters between the putative parents. A table of diagnostic characters for the new hybrid and its putative parents, a comparative figure, and a map showing the geographical distributions are provided.