Present study was conducted to document the icthyofaunal diversity of Bokaro district Jharkhand during Monsoon season. Survey were made on River, Reservoir and major hill stream area of Bokaro district Jharkhand during June to September2017.A total 42 species of fishes belonging to the 6 order 16 families and 28 genera. Out of the total 42 species of fishes 18 species belonging, Cypriniformes,12 species is in Perciformes 08 species is in Siluriformes 02 species is in Synbrachiformes and one species of each Mugilliformes and Osteoglossiformes order .Further the fish species belonging to 15 species is in Cyprinidae family,04 species is in Channidae family,03 species of each Bagaridae and Cichilidae,02 species of each is in Mastacembelidae and Ambassidae Family and 01 species of each Botiidae,Siluridae, Bel itoridae, Cobitidae, Gobi idae, Bel itoridae, Notopteridae,, Al l idae,Sisoridae, Claridae,Heteropneustidae,Siluridae,Mugilidae and Anabantidae family. Further Sorenson’s value of data is 0.72 which shows more than fifty percent and less than hundred percent similarity of the species in three different habitat of aquatic body of the Bokaro District. Data also shows that in out of 42 species 35 species is in LC category,06 are under NT category and 01 species consider under DD in IUCN Red list.