Onycha is a town in Covington County, Alabama, United States. At the 2020 census, the population was 167. Onycha is located in eastern Covington County at 31°13′17″N 86°16′40″W / 31.22139°N 86.27778°W. According to the U.S. Census Bureau, the town has a total area of 0.81 square miles, of which 0.008 square miles, or 1.18%, is water.