A Gram-negative marine bacterium, designated strain En6(T), was isolated from seawater of the East Sea of Korea. The organism grew in 1-25 % (w/v) NaCl and at 10-37 degrees C and pH 5.3-9.3, with optimal growth occurring in 4-5 % NaCl and at 25-30 degrees C and pH 7.5. Phylogenetic analysis of the 16S rRNA gene sequence of strain En6(T) placed this bacterium in the clade Marinobacter within the class Gammaproteobacteria. The 16S rRNA gene sequence similarity between strain En6(T) and Marinobacter lipolyticus SM19(T), the most closely related species, was 98.4 %, and the level of DNA-DNA relatedness between the two strains was 22 %. On the basis of the phylogenetic analysis and phenotypic and chemotaxonomic data, strain En6(T) is considered to represent a novel species of the genus Marinobacter. The name Marinobacter goseongensis sp. nov. is proposed, with strain En6(T) (=KCTC 12515(T)=DSM 19471(T)) as the type strain.