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A Gram-stain-negative, rod-shaped, aerobic, non-motile bacterium, designated Y620-1(T) was isolated from a glacier on the Tibetan Plateau, China. The 16S rRNA gene sequence of the novel isolate shared 93.6-95.1% similarity with type strains of species of the genus Dyadobacter. The major fatty acids of strain Y620-1(T) were summed feature 3 (C-(16:1)omega 7c and/or iso-C-15:0 2-OH), iso-C-15:0, C-16:1 omega 5c and iso-C-17:0 3-OH. The predominant isoprenoid quinone and polar lipid were MK-7 and phosphatidylethanolamine (PE), respectively. The DNA G+C content was 44.4 +/- 0.3 mol% (T-m). Flexirubin-type pigment was produced. The novel isolate was classified in the genus Dyadobacter, but a number of phenotypic characteristics distinguished the novel isolate from type strains of species of the genus Dyadobacter. From these genotypic and phenotypic data, it is evident that strain Y620-1(T) represents a novel species of the genus Dyadobacter, for which the name Dyadobacter tibetensis sp. nov. is proposed. The type strain is Y620-1(T) (=JCM 18589(T)=CGMCC 1.12215(T)).