Bassianae or Bassiana (Serbian: Basijana or Басијана) was an important ancient Roman town in Pannonia (today Syrmia region in Vojvodina province, Serbia). It was located near present-day Donji Petrovci, a village in the Ruma municipality. Bassianae was the second largest town in Syrmia, after Sirmium. It was located on a road that connected Sirmium and Singidunum.