In this research zooplankton distribution of UzunçayÃÂ±r Dam Lake were determined between March 2010 - February 2011. Zooplankton samples were taken regularly in each month from the dam lake. pH, dissolved oxygen and water temperature values were recorded in situ by us-ing portative equipments. In the dam lake 23 zooplankton species were recorded. All of these species 15 species from Rotifera, 6 species from Cladocera and 2 species from Copepoda were identified. The most attractive species were from Rotifera because of its species richness and number of individuals. Especially in spring months zooplankton were recorded in highest indi-vidual numbers and species. Numbers of species diversities were determined high in May (12 species). The study has got an importance as to be the first research on zooplankton in UzunçayÃÂ±r Dam Lake.