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Marine bioprospecting is a dynamic research field that explores the oceans and their biodiversity as noteworthy sources of new bioactive compounds. Anthozoans are marine animals belonging to the Cnidaria phylum characterized by highly specialized mechanosensory cells used both for defence against predators and prey capture. Here, high concentration of cnidocysts have been isolated from the Mediterranean zoanthid coral <i>Parazoanthus axinellae</i> (Schmidt, 1862) and their antimicrobial potential has been investigated. The cnidocyst extract exerted significant antibacterial activity against some human pathogens capable of developing resistance to conventional antibiotics such as <i>Streptococcus agalactiae</i> and <i>Coccus</i> sp., and against several <i>Vibrio</i> species, including some microbial strains for humans and farmed fish, such as <i>Vibrio alginolyticus</i>, <i>Vibrio anguillarum</i>, <i>Vibrio fischeri</i>, <i>Vibrio harveyi</i>, and <i>Vibrio vulnificus</i>. Results have been discussed in light of both the ecological aspects and biotechnological value of the cnidocyst extract in the nutritional, nutraceutical, and pharmaceutical fields.