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The effects of ultrasound (US)-assisted plasma-activated water (PAW) washing (UP) on the growth of indigenous bacteria, quality properties, and microbiome of fresh-cut Apium graveolens (celery) were investigated. Among the tested treatments (UP, NaClO solution, US alone, and PAW alone), UP was the most effective in decontaminating fresh-cut celery and inhibiting the growth of natural bacteria in the celery during storage at 4 and 10 °C. No significant differences were observed in the firmness, color, or sensory properties between untreated and UP-treated fresh-cut celery during storage. The proportion of Proteobacteria and Actinobacteria on UP-treated fresh-cut celery decreased after storage at 4 °C for 3 days, confirming the influence of UP treatment on the celery microbiome. The UP treatment induced alterations in the microbial composition of celery. These results demonstrate the potential utility of UP treatment as a novel microbial decontamination process for the preparation of fresh-cut celery products., Competing Interests: Conflict of interestThe authors declare no conflict of interest., (© The Korean Society of Food Science and Technology 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.)