Dembi Dolo, also spelled Dembidollo, is a market town and separate woreda located in south-western Ethiopia. It serves as the capital of the Kelam Welega Zone within the Oromia Region.
The town was originally known as Sayo. It sits at an elevation ranging between 1,701 meters (5,581 feet) and 1,827 meters (5,994 feet) above sea level.