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<i>Campylobacter</i> is among the four main causes of gastroenteritis worldwide. Most reported <i>Campylobacter</i> infections are caused by <i>C. jejuni</i> and <i>C. coli</i>. However, other emerging <i>Campylobacter</i> pathogens have been recognized as important pathogens in humans and animals. A novel bacterial strain, PS10^T, was isolated from the gastric mucous of pigs in 2022 in Beijing, China. The cell was Gram-negative, microaerobic, motile, and negative for catalase, oxidase, and urease. Phylogenetic and phylogenomic analyses based on the 16S rRNA gene and core genome indicated that this isolate belongs to the genus <i>Campylobacter</i>. There were low dDDH relatedness and ANI values shared within this strain and its closest species <i>C. mucosalis</i> below the cut-off values generally recognized for isolates of the same species. The draft genome size of PS10^T is 2,240,910 bp in length with a percentage of DNA G+C contents of 37.72%. Comparing the phenotypic and phylogenetic features among this isolate and its related organisms, strain PS10^T represents a novel species within the genus <i>Campylobacter</i>, for which the name <i>Campylobacter gastrosuis</i> sp. nov. (Type strain PS10^T = GDMCC 1.3686^T = JCM 35849^T) is proposed.