Abstract: Background and Objective: Since phytoplankton act as primary producers in most of the aquatic bodies and fish production are associated with phytoplankton primary productivity. Therefore, the objective of the current study was aimed to investigate phytoplankton diversity at the three selected stations (the station I, II and III) of Morvan Dam (Neemuch District, M.P.), India through seasonal surveys (Winter, Summer and Monsoon) concerning different physico-chemical profile during two annual cycles 2016-17 and 2017-2018. Materials and Methods: The plankton samples were collected seasonally from three sampling stations of Morvan Dam and counted through the counting chamber under a C.Z., inverted microscope as cells mL–1 and was preserved in 70% alcohol. The qualitative analysis and diversity of phytoplankton were done as per standard formulae. Results: The Chlorophyceae exhibited the highest phytoplanktonic density among all the selected three-station, followed by Bacillariophyceae, Myxophyceae, Dinophyceae, Desmidiaceae and Xanthophyceae. The seasonal variation in density of Chlorophyceae, Xanthophyceae, Bacillariophyceae, Desmidiaceae, Myxophyceae and Dinophyceae were documented in the range from 250-810, 00-35, 210-520, 10-75, 130-400 and 0-200 mL–1, respectively among all the three selected station of Morvan Dam during 2016-18. However, the total density of recorded phytoplanktonic species was found to vary from 1140-1525, 1035-1430 and 940-1405 mL–1 at the stations I, II and III, respectively during 2016-18. Eventually, phytoplanktonic density, based upon Menhinick's, index at station I, II and III were noticed as 0.462458306, 0.345262562 and 0.431870654, respectively, whereas the overall phytoplanktonic diversity of Morvan Dam was estimated at 0.717249045 during 2016-18. Conclusion: Morvan Dam consists of large and diverse kinds of phytoplankton species which has been documented as Chlorophyceae>Bacillariophyceae> Myxophyceae>Dinophyceae>Desmidiaceae>Xanthophyceae (in order of abundance). The species richness of phytoplankton indicates the low pollution status and good health of other aquatic organisms in the dam during the specified period.