Hemidactylus mercatorius is a species of gecko. There has been confusion between it and Hemidactylus mabouia, making it difficult to establish the ranges of the species. While the Reptile Database gives Hemidactylus mercatorius a wide distribution in eastern Africa, the IUCN restricts its native distribution to Madagascar and some other islands in the Indian Ocean (the Comoros, Seychelles, Mayotte).