Sofia Public Transport

The public transport in Sofia consists of a comprehensive network of bus, trolleybus, tram and metro lines. It is overseen by the Sofia Urban Mobility Center, a municipal enterprise responsible for route planning, scheduling, fare collection and ticket inspection. It also pays the various transport operators for their service on a per-kilometer basis. Sofia is the only city in Bulgaria that operates the four modes of public transport.

As of 2023, public transport in Sofia is operated by 3 municipal and 1 private company:
 * Столичен автотранспорт ЕАД (Sofia Public Bus Transport Company JSC) operates the majority of bus services
 * Столичен електротранспорт ЕАД (Sofia Public Electrical Transport Company JSC) operates the tram and trolleybus networks
 * Метрополитен ЕАД (Metropoliten JSC) operates the Sofia Metro
 * Private company MTK Group operate some, mainly suburban, bus services