Bus transport in Cardiff, the capital and most populous city in Wales, forms the major part of the city's public transport network, which also includes an urban rail network, Waterbus and international airport. Cardiff is a major city of the United Kingdom and a centre of employment, retail, business, government, culture, media, sport and higher education.
Most of the city's comprehensive bus network is operated by Cardiff Bus, which is owned by Cardiff Council. The main hub and terminus of the network was Cardiff Central bus station, which closed for redevelopment of the site in the autumn of 2015. The new Cardiff Bus Interchange opened in June 2024.
Operators such as Stagecoach South Wales and Newport Bus link the city with other urban areas in South Wales. Adventure Travel operates services including the Fflecsi demand responsive service in north Cardiff. TrawsCymru operates a long-distance route to Aberystwyth, Cardiff Airport (currently suspended) and West Wales, while National Express, Megabus and FlixBus operate long-distance coaches to towns and cities throughout Wales, Scotland and England.