The General Post Office is the former headquarters of An Post — the Irish Post Office. It remains its registered office and the principal post office of Dublin — the capital city of Ireland — and is situated in the centre of O'Connell Street, the city's main thoroughfare. It is one of Ireland's most famous buildings, not least because it served as the headquarters of the leaders of the Easter Rising against British rule in Ireland. It was the last great Georgian public building to be erected in the capital.

An Post is the state-owned provider of postal services in Ireland. An Post provides a "universal postal service" to all parts of the country as a member of the Universal Postal Union. Services provided include letter post, parcel service, deposit accounts, Express Post, and EMS.