A species new to science, Alocasia epilithica Serebryanyi, K.Z.Hein & Naive discovered in Tanintharyi Region, Myanmar, is herein described and illustrated. This new species was also found to occur in the provinces of Nakhon Si Thammarat and Surat Thani of Peninsular Thailand. Detailed description, color plates, discussion of similar taxa, phenology, distribution map and a preliminary conservation status assessment are provided.