Diphyllobothriasis is a parasitic infection caused by cestodes of the Diphyllobothriidae family, commonly called as broad or fish tapeworms. This infection poses a significant public health challenge, with an estimated 20 million people worldwide affected by various species of Diphyllobothrium (syn. Dibothriocephalus) that can infect humans. The primary mode of transmission is through the consumption of raw or undercooked fish. In humans, while Dibothriocephalus latus (formerly Diphyllobothrium latum) is the most frequently identified infection species, other species, such as Dibothriocephalus dendriticus (formerly Diphyllobothrium dendriticum), Dibothriocephalus nihonkaiensis (formerly Diphyllobothrium nihonkaiense), Adenocephalus pacificus (formerly Diphyllobothrium pacificum), Diphyllobothrium balaenopterae, and Diphyllobothrium stemmacephalum, can also cause zoonotic disease. Unlike taeniid tapeworms, these parasites exhibit a complex life cycle that involves aquatic intermediate hosts and various terrestrial definitive hosts, including canines, felines, ursids, avians, and even humans. Diphyllobothriasis, while frequently asymptomatic, may present gastrointestinal manifestations, including vomiting, diarrhoea, abdominal pain, and anaemia, and in rare instances, chronic infections can result in intestinal obstruction. The recent trend of consuming raw fish dishes has especially contributed to an increase in human infections and outbreaks, even in regions that are not typically endemic to this parasite.