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A new species in the dicroglossid frog genus <i>Limnonectes</i> is described from Ko Pha-ngan, Ko Samui, and Ko Lanta Yai Islands in southern Thailand. Males of <i>Limnonectes pseudodoriae</i> <b>sp. nov</b>. lack a caruncle on top of the head and very closely resemble <i>L. doriae</i> (Boulenger, 1887) from Myanmar and western and southern Thailand. However, the new species is distinguished from <i>L. doriae</i> and its congeners using an integrative taxonomic approach of morphology, mitochondrial DNA, and bioacoustics. <i>Limnonectes pseudodoriae</i> <b>sp. nov</b>. differs from <i>L. doriae</i> and its congeners by having a unique combination of morphological characters, including body size; skin texture of the interorbital region, dorsum, and shank; toe webbing; relative size of the inner metatarsal tubercle; and coloration of the tympanum, venter, and ova. The advertisement call of the new species is also readily differentiated from that of <i>L. doriae</i> in temporal parameters. <i>Limnonectes pseudodoriae</i> <b>sp. nov</b>. is highly divergent in mitochondrial DNA from <i>L. doriae</i> and its congeners, but its phylogenetic position within the genus is not resolved. The natural history of the new species is presented, and the geographic range of <i>L. doriae</i> in Thailand is clarified.