A novel actinomycete, strain FXJ7.203(T), was isolated from a coastal sediment sample collected in Bohai Bay, China. In 16S rRNA gene sequence analyses, strain FXJ7.203(T) always formed a unique monophyletic line within the genus Nonomuraea and was most closely related to Nonomuraea turkmeniaca (97.9 %), Nonomuraea candida (97.8 %), Nonomuraea helvata (97.7 %) and Nonomuraea rubra (97.5 %). Morphological and chemotaxonomic characteristics supported the allocation of the strain to the genus Nonomuraea. The polar lipid profile showed that its phospholipid type was PIV. The major fatty acids were iso-C(16 : 0), C(17 : 1)ω6c, iso-C(16 : 1) G, 10-methyl C(17 : 0) and iso-C(15 : 0). The major menaquinone was MK-9(H(4)) with minor amounts of MK-9(H(2)), MK-9(H(0)) and MK-9(H(6)). The results of physiological and biochemical tests allowed differentiation of strain FXJ7.203(T) from closely related species. Based on the genotypic and phenotypic data, strain FXJ7.203(T) represents a novel species of the genus Nonomuraea, for which the name Nonomuraea maritima sp. nov. is proposed, with strain FXJ7.203(T) ( = CGMCC 4.5681(T) = NBRC 106687(T)) as the type strain.