Biodiversity may be defined as species richness (plants, animals and micro-organisms) in a given habitat be it on land, in fresh water or sea or as parasites or symbionts. Biodiversity represents sum total of various types of microbes, plants and animals present in that system. It is the variability among living organisms from all sources including terrestrial, marine and other aquatic ecosystem and the ecological complexes of which they are a part and includes diversity within species, between species, and ecosystem. Wetlands are the transitional zones between the terrestrial and aquatic environment. These habitats perform major ecological role in biosphere. They are immense use of mankind both economically and ecologically. Present paper depicted that the diversity on helminth fauna of freshwater fishes from Nambol Locality of Bishnupur District of Manipur. The study was conducted between April to August 2013 and found four groups of parasites in 600 fishes. The fishes belong to five different orders and thirteen families. Among the fishes, 279 are found infected with helminth parasites belonging to four different groups i.e., class Acanthocephala, class Cestoda, class Trematoda and 13 belongs to class Nematoda.