Freshwater wetlands are ecologically important ecosystems that support rich biodiversity and maintain aquatic productivity. The present study was conducted to investigate the diversity, distribution, and ecological significance of zooplankton communities in selected wetlands of Saharanpur district, Uttar Pradesh, India. Zooplankton samples were collected using a standard plankton net and identified based on morphological characteristics. Major zooplankton groups recorded during the study included Rotifera, Cladocera, Copepoda, and Protozoa. Rotifera (40%) and Cladocera (35%) were found to be the dominant groups, while Copepoda and Protozoa showed comparatively lower abundance. Physicochemical parameters such as temperature, pH, dissolved oxygen, BOD, COD, TDS, conductivity, nitrate, phosphate, and turbidity were analyzed to evaluate their influence on zooplankton diversity. Diversity indices including Shannon– Wiener Index, Simpson Diversity Index, and Margalef Richness Index indicated moderate to high zooplankton diversity and ecological stability in most wetlands. Okhla Bird Sanctuary Wetland exhibited comparatively higher diversity values, whereas Bakhira Wetland showed relatively lower diversity due to higher organic and nutrient load. The study highlights the ecological importance of freshwater wetlands in maintaining zooplankton diversity and emphasizes the need for wetland conservation and sustainable management practices.