The Sofia public bus system (Bulgarian: Автобусен транспорт София) forms part of the public transport network of Sofia, the capital city of Bulgaria.

Soon after that six more lines were opened, bringing the total network length to 23 km.

[2] During the communist era, the bus fleet consisted mainly of Ikarus and Bulgarian-made Chavdar buses.

It was launched by Sofia Urban Mobility Center on an experimental basis from 7 April 2018 until 31 December 2018.

In November of 2023, the N1 and N2 lines were re-established, with the rest of the network being brought back in December of the same year, but with changed routes:[6]