Dublin Bus 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 wholly-owned subsidiary of Córas Iompair Éireann.

Bus Éireann is a state-owned bus and coach operator providing services throughout Ireland, with the exception of Dublin and the Greater Dublin Area, where bus services are provided by sister company Dublin Bus. It is a subsidiary of Córas Iompair Éireann (CIÉ). The company's primary hub is Busáras, located in Store Street, Dublin. In 2022 it operated 229 Public Service Obligation Routes, 14 expressway routes and 8940 school transport routes.