Mihăilești is a town located in Giurgiu County, Muntenia, Romania. It administers three villages: Drăgănescu, Novaci and Popești. It officially became a town in 1989, as a result of the Romanian rural systematization program.
The town stands beside the river Argeș, which at this point is dammed, forming a lake about 5 kilometres (3.1 mi) long. It was created as part of the Danube–Bucharest Canal project and feeds an hydro-electric plant.
Popești village is the location of an important archeological discovery: a large Dacian settlement believed by some historians such as Vasile Pârvan and professor Radu Vulpe to be the Argedava mentioned in the Decree of Dionysopolis. This ancient source links Argedava with the Dacian king Burebista, and it is believed to be his court or capital.