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The application of molecular methods combined with improved and more widespread recording of vocalizations, and increased sampling by ornithologists and bird banders across the breeding and wintering ranges of Asian birds, has greatly increased understanding of the taxonomy and distribution of sibling species among warbler genera. Among these, the large warbler genus Phylloscopus, with c. 60 species, is possibly the most taxing for identification. We here document the addition of both Kamchatka Leaf Warbler P. examinandus and Sakhalin Leaf Warbler P. borealoides to the Thai avifauna, based on analysis of mitochondrial DNA recovered from tail feathers of birds trapped for banding and subsequently released. The wide-ranging Arctic Warbler P. borealis was recently recognized as a complex of three species, including Japanese Leaf Warbler P. xanthodryas (breeding in Honshu to Kyushu), and Kamchatka Leaf Warbler P. examinandus which breeds in Kamchatka, Sakhalin and Hokkaido (Dickinson & Christidis 2014). Although P. examinandus was usually treated as an intergrade between P. borealis and P. xanthodryas (e.g., Ticehurst 1938) it has since been shown to lie in a separate clade from the other two species in the complex, differing in morphology and song (Alström et al. 2011, Saitoh et al. 2006, 2008, 2010). Arctic Warbler (sens. lat.) is a widespread and common passage migrant and winter visitor in Addition of Kamchatka Leaf Warbler Phylloscopus examinandus and Sakhalin Leaf Warbler P. borealoides to Thailand's Avifauna