The Sofia tram network is a vital part of the public transportation system of Sofia, the capital of Bulgaria. It began operation on January 1, 1901. As of 2006, the tram system included approximately 308 kilometres of narrow and standard gauge one-way track. Most of the track is a narrow gauge, with standard gauge used on lines 20, 21, 22 and 23 and accounting for approximately 40 kilometres (25 mi) of the system's track length.

The Sofia Urban Mobility Center (SUMC) is the transit authority responsible for public transport in Sofia, the capital of Bulgaria. It is one of the municipal companies controlled by Stolichna Municipality.