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https://www.lexology.com/library/det...06-25&utm_term=
Transit
In what circumstances is a transit visa required to pass through your jurisdiction? How is it obtained?
Certain non-EEA nationals need an Irish transit visa when transiting in Ireland before travelling to another jurisdiction. An Irish transit visa permits the holder to enter Ireland for transit purposes only. The holder cannot leave the relevant port and must have a relevant visa (if required) for the country to which they are travelling. The application for an Irish transit visa is made online and submitted to the nearest Irish embassy for processing with the required supporting documentation. The Department of Justice and Equality recommends that transit visa applications (and all other Irish visa applications) be submitted eight weeks before travelling; however, in practice, applications are processed more quickly.