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A Gram-stain-negative, facultatively aerobic, pink and oval bacterium, designed OS4^T, was isolated from a sediment sample taken from a coastal zone in China. The growth of OS4^T occurred at 20–37 °C (optimal 25 °C), pH 7.0–8.5 (optimal pH 8.0), in 0–5.0% (<i>w</i>/<i>v</i>) NaCl (optimal 2.0%). According to the phylogenetic analysis, strain OS4^T showed the highest sequence similarity (96.04%) with <i>Jannaschia aquimarina</i> GSW-M26^T and shared 94.98% similarity with the type species of genus <i>Jannaschia</i>-<i>strain J. helgolandensis</i> 14858^T. Chemotaxonomic analysis showed that the sole respiratory quinone was ubiquinone 10, and the major fatty acids (>5.0%) included C_18:1 ω6c/ω7c, C_18:0, and C_10:0 3OH. The polar lipids consist of three phospholipids, two unknown amino-lipids, and four unknown glycerolipids. The DNA G + C content was 72.7 mol%. Based on the evidence presented in this study, strain OS4^T represents a novel species of the genus <i>Jannaschia</i>, for which the name <i>Jannaschia</i> <i>sedimins</i> sp. nov. is proposed. The type strain is OS4^T (=KCTC 82508^T = MCCC 1K03755^T). Both the phenotypic and the genetic analysis on the antimicrobial resistance genes indicate that OS4^T is resistant to a wide range of classes of antibiotics, which highlights that the ocean could potentially serve as the natural reservoir of antimicrobial resistance genes.