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The phenotypic and phylogenetic characteristics of an aerobic, Gram-negative, motile, non-pigmented Alteromonas-like bacterium (designated strain KMM 3894T), isolated from a sandy sediment sample collected offshore of the Sea of Japan, were investigated. Comparative 16S rRNA gene sequence analysis revealed that strain KMM 3894T belonged to the genus Aestuariibacter and was most closely related to Aestuariibacter halophilus JC2043T (95.5 % sequence similarity). Fatty acid analysis showed C16 : 1 ω7c, C18 : 1 ω7c, and C16 : 0 as the dominant components. Strain KMM 3894T could be differentiated from recognized species of the genus Aestuariibacter by its ability to grow at 4 °C and at 30 °C, the optimum temperature for growth, and its inability to utilize most carbohydrates. On the basis of the phenotypic, chemotaxonomic and phylogenetic data, strain KMM 3894T is considered to represent a novel species of the genus Aestuariibacter, for which the name Aestuariibacter litoralis sp. nov. is proposed. The type strain is KMM 3894T (=NRIC 0754T=JCM 15896T).