The Great Seal of the Irish Free State (Irish: Séala Mór do Shaorstát Éireann) is either of two seals affixed to certain classes of official documents of the Irish Free State (Saorstát Éireann):
- the "internal" Great Seal, used from 1925 for "internal" documents (of domestic law) signed by the Governor-General
- the "external" Great Seal, used from 1932 for diplomatic documents signed by the British king.
A new seal, for documents signed by the President of Ireland, replaced the internal seal in 1937, when the Constitution of Ireland came into force; it replaced the external seal in 1949 when the Republic of Ireland Act came into force.