During present study on the helminth parasites of herring gulls (Larus argentataus) in El Manzala Lake and Mediterranean Sea near Port Said city of Egypt, a total of 65 birds were infected with one or more species of intestinal digenetic trematodes, including6 species, Petasiger grandevesicularis, Petasiger jubilarum, Petasigerskrjabini,Stephanoprora spinosa,Dolichosacculus solecarius and Tylodelphys sp. The morphometric features of each species were compared with earlier descriptions. The total prevalence of parasitic infestation in herring gulls was 61.54%. The prevalence of isolated trematodes were: P. grandevesicularis 25,00  %, P. jubilarum 9.23 %, P. skrjabini 7.69 %, S. spinosa 12.30 %, D. solecarius 7.69 % and Tylodelphys sp. 9.23 %. The public health hazards of the isolated parasites were discussed.