Pachypodium geayi is a species of Pachypodium in the Dogbane Family (Apocynaceae) that originated from Southwest Madagascar. It has a succulent, metallic grey pachycaul trunk with uniformly spaced thorns, and the leaves are thin and grey-green, with a bright pink mid-rib. The plant has white flowers. Pachypodium geayi is one of the largest of the Madagascar species.