| Summary: | Parasite monitoring is considered a necessary step for cetacean management and conservation. Between February 2013 and July 2015, 26 dolphins (15 <i>Stenella coeruleoalba</i>, 10 <i>Tursiops truncatus</i>, and one <i>Grampus griseus</i>) stranded along the Tuscan coastline of the protected marine area “Pelagos Sanctuary”, were examined. Organs, tissues, and faecal and blood samples taken from all animals were analysed by parasitological, immunological, and molecular techniques. Twenty-one out of 26 dolphins (80.77%) tested positive for at least one parasite species, and 13/15 (86.7%) <i>S. coeruleoalba</i>, 7/10 (70%) <i>T. truncatus</i>, and the single <i>G. griseus</i> were found positive. Identified parasites included the nematodes <i>Skrjabinalius guevarai</i> (7.69%, 2/26), <i>Halocercus lagenorhynchi</i> (3.85%, 1/26), <i>Halocercus delphini</i> (7.69%, 2/26), <i>Stenurus ovatus</i> (7.69%, 2/26), <i>Crassicauda</i> spp. (7.69%, 2/26); the trematodes <i>Pholeter gastrophilus</i> (26.92%, 7/26), <i>Campula palliata</i> (3.85%, 1/26); the cestodes <i>Phyllobothrium delphini</i> (42.31%, 11/26), <i>Monorygma grimaldii</i> (23.08%, 6/26), <i>Tetrabothrium forsteri</i> (7.69%, 2/26), <i>Strobilocephalus triangularis</i> (7.69%, 2/26), and the acanthocephalan <i>Bolbosoma vasculosum</i> (7.69%, 2/26). Moreover, 6/26 (23%) animals scored positive to <i>Toxoplasma gondii</i> at serology, but PCR confirmed the infection (<i>T. gondii</i> Type II genotype) in a single animal. In examined dolphins, obtained results showed a high prevalence of endoparasites, which included species considered as a cause of severe debilitation or death.
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