Lake Çavuşçu (also known as Lake Ilgın) is a fresh water lake in Turkey

The lake is situated in Ilgın ilçe (district) of Konya Province at 38°20′36″N 31°52′39″E / 38.34333°N 31.87750°E / 38.34333; 31.87750. Its elevation with respect to sea level is about 1,110 metres (3,640 ft). Its surface area is 3,123 hectares (7,720 acres).

The lake is fed by Battal and Çebişli creeks.

The birds of the lake are the following: Moustached warbler, whiskered tern, black tern, common tern, stork, red-crested pochard, greylag goose. Among the fishes of the lake cobitis turcica is an endemic species of Turkey.