Seasonal variation of rotifers density and species richness was studied of Yashwant Lake. This reveled that the density of rotifers was maximum in summer, while it was minimum in post- monsoon. Maximum species richness of rotifers was recorded in summer Minimum species richness was recorded in winter. The rotifer community structure depends on a variety of environmental factors that include biological parameters, such as predation or competition, as well as various physico-chemical factors.