The survey of some tadpole species in Thailand was conducted between December 1998 to March 2004. The 44 species of tadpoles were found from many parts of Thailand. The species are following: Brachytarsophrys carinensis (Boulenger, 1889), Leptobrachium hendricksoni Taylor, 1962, Leptolalax gracilis (Gunther, 1872), Leptolalax pelodytoides (Boulenger, 1893), Megophrys parva (Boulerger, 1893), Ansonia malayana Inger, 1960, Bufo macrotis Boulenger, 1887, Bufo parvus Boulenger, 1887, Amolops marmoratus (Gunther, 1859), Amolops sp., Fejervarya cancrivora (Gravenhorst, 1829), Fejervarya limnocharis (Gravenhorst, 1829), Hoplobatrachus rugulosus (Wiegman, 1835), Limnonectes kuhlii (Dumuril and Bibron, 1841), Limnonectes blythii (Boulenger, 1920), Occidozyga lima (Gravenhorst, 1829), Occidozyga martensii (Peters, 1867), Paa fasciculispina (Inger, 1970), Rana alticola Boulenger, 1882, Rana chalconota (Schlegel, 1837), Rana erythraea (Schlegel, 1837), Rana livida (Blyth, 1856), Rana nigrovittata (Blyth, 1855), Chirixalus hansenae Cochran, 1827, Chirixalus vittatus (Boulenger, 1887), Polypedates leucomystax (Gravenhorst, 1829), Rhacophorus bipunctatus Ahl, 1927, Rhacophorus sp., Theloderma asperum (Boulenger, 1886), Calluella guttulata (Blyth, 1855), Glyphoglossus molossus Gunther, 1868, Kalophrynus interlineatus (Blyth, 1855), Kaloula pulchra Gray, 1831, Microhyla berdmorei (Blyth, 1856), Microhyla butleri Boulenger, 1900, Microhyla heymonsi Vogt, 1911, Microhyla ornata (Dumeril and Bibron, 1841), Microhyla pulchra (Hallowell, 1861), Micryletta inornata (Boulenger, 1890). Two of them, Leptobrachium sp. and Rhacophorus sp. have been studied for more details about mouth part, mor- phology to identify species.