An inventory of reptiles and amphibians on the Koh Man Islands and in the coastal Prasae estuaries in Rayong Province, South-eastern Thailand, was compiled by the general survey technique, mainly by captures along nature trails on the three islands: Koh Man Ni, Koh Man Klang and Koh Man Nok, and in the coastal area at the mouth of the Prasae River. 19 species of reptiles and four species of amphibians were collected and identified.