The aquatic organisms are the good indicators of health of an aquatic ecosystem and represent the balanced ecosystem. The present study was conducted to understand the current status of faunal diversity in Durgadahalli Lake, located in the North-East of Tumakuru district, at distance of 15 km from Tumakuru city in Karnataka. It lies at 13° 13’ 56” N latitude and 77° 25’ 30” E longitude. It receives water mainly from rain-fall with an average of 620 mm and from Jayamangalli river. The Lake comparatively smaller with rich aquatic faunal diversity and recorded 20 species of zooplankton, 9 species of aquatic insects belonging to Hemiptera, Coleoptera, Odonata and Diptera,One molluscan shell, 2 amphibia species (frog) and one reptilian species (turtle).The water collected and analyzed from fve selective sampling stations of the Lake from 2016 to 2019. Not many reports are available on Durgadahalli Lake with respect to faunal diversity. Keeping it in mind, we have selected Durgadahalli Lake for the present study on ecology and aquatic faunal diversity