Bahram III, was the sixth king (shah) of the Sasanian Empire. He was son and successor of Bahram II. As a prelude to his kingship he was viceroy in the province of Sakastan, which had been re-conquered by his father sometime in the 280s.

Sistān, also known as Sakastān and Sijistan, is a historical region in present-day south-eastern Iran, south-western Afghanistan and extending across the borders of south-western Pakistan. Mostly corresponding to the then Achaemenid region of Drangiana and extending southwards of the Helmand River not far off from the city of Alexandria in Arachosia. Largely desert, the region is bisected by the Helmand River, the largest river in Afghanistan, which empties into the Hamun Lake that forms part of the border between Iran and Afghanistan.