The paper described the phoretic associations between larvae of Nanocladius asiaticus (Diptera, Chironomidae) and its hosts Gestroiella (Heteroptera, Naucoridae) in streams. The result revealed that the most frequent attachment site was along the mesofemur and mesosternum of the naucorids hosts. This paper presents for the first time a symphoretic relationship between a species of N. asiaticus and E. masoni (Odonata, Euphaeidae) from western Thailand.