Derai (Bengali: দিরাই) is an Upazila of Sunamganj District in the division of Sylhet, Bangladesh. It is located at 24°47′00″N 91°21′00″E / 24.7833°N 91.3500°E / 24.7833; 91.3500
As of the 1991 Bangladesh census, Derai has a population of 185284. Males constitute 51.38% of the population, and females 48.62%. Derai has an average literacy rate of 25.3% (7+ years), and the national average of 32.4% literate.