You may need a visa to enter Ireland. The Embassy in Addis Ababa processes applications from nationals and legal residents of Ethiopia and South Sudan. The Irish Naturalisation and Immigrations Service (INIS), based in Dublin, has overall responsibility for immigration and visa matters. You will find detailed information on visas, as well as responses to Frequently Asked Visa Questions on the INIS website.
The granting of a visa is a form of pre-entry clearance which effectively allows the holder to travel to Ireland. The Immigration Officers at the port of entry have the authority to grant or deny admission. Visa holders are subject to normal immigration controls. Always carry with you copies of the documents submitted with your visa application for possible inspection by Immigration Officers. The dates on your visa indicate the timeframe during which you may seek to enter Ireland and do not grant permission to remain in Ireland.
Remember...If you’re a citizen of a non-EU country, whether you need a visa or not, you will be subject to immigration control when you enter Ireland.