Beciu is a commune in Teleorman County, Muntenia, Romania. It is composed of three villages: Bârseștii de Jos, Beciu, and Smârdan. These were part of Plopii-Slăvitești Commune until 2004, when they were split off.

The commune is situated on the Wallachian Plain, at an altitude of 92 m (302 ft), on the left bank of the Olt River. It is located in the western part of Teleorman County, 69 km (43 mi) from the county seat, Alexandria, on the border with Olt County.