Rhagovelia inexpectata has been reported from Laos, Thailand, and Vietnam (Zettel 2000). In Thailand, this species was previously collected in Chiang Mai, Mae Hong Son, Phrae, Tak, and Ubon Ratchathani provinces (Zettel 2000). In this study, this species was colleted from streams in the central (Kanchanaburi, Ratchaburi and Uthai Thani provinces). This species occurred synoptically with several congeners.