The caddisfly family Hydropsychidae, containing about 1,500 described species is the 3rd largest family in Trichoptera. They are among the important components of biomonitoring programs because of their abundance and wide range of pollution tolerance values among species. In tropical Southeast Asia, 12 genera were currently recognized belonging to three subfamilies: Diplectroninae, Macronematinae, and Hydropsychinae. Herein, updated checklist and distribution of tropical Southeast Asian Hydropsychidae species were provided based on the review of published literatures and the trichoptera world website. As a result, a total of 356 species of tropical Southeast Asian Hydropsychidae have been described wherein the four most abundant genera were Hydropsyche (116 species), Cheumatopsyche (91 species), Diplectrona (42 species), and Hydromanicus (35 species). Tropical Southeast Asian Trichoptera studies were mostly done in Vietnam, Thailand, Indonesia, and in the Philippines making some other tropical Southeast Asian countries unexplored.