Dublin Bus (Irish: Bus Átha Cliath) is an Irish state-owned bus operator providing services in Dublin. By far the largest bus operator in the city, it carried 145 million passengers in 2023. It is a subsidiary of Córas Iompair Éireann.
Dublin Bus was established on 2 February 1987, when Córas Iompair Éireann was split into 3 subsidiaries, Dublin Bus, Bus Éireann and Irish Rail. In September 2011, Dublin Bus received a significant technological upgrade with its introduction of real time passenger information.