The rule will come into place from Saturday.
All passengers arriving into Ireland will have to provide a negative Covid-19 test prior to departure from this Saturday (16 January).
The negative test must be taken within 72 hours prior to arrival in Ireland.
This was previously the case with those coming into the country from the UK and South Africa, but it has now been extended to all foreign countries.
A statement released on Tuesday evening reads: "Arrivals from Great Britain and South Africa will continue to require a negative/not detected PCR test *AND* must continue to isolate for 14 days, even if they take a second test after arrival."
Arrivals from red and grey list countries, as defined by the EU traffic light system, and all other locations outside of Europe must restrict their movements for 14 days.
While a negative test will still be necessary, people arriving from green and orange list countries will not be required to restrict their movements on arrival. However, they must adhere to the local public health guidance.
Children under six will be exempt, as will Gardaí.
Checks will be conducted by Border Management Unit at Dublin Airport and by An Garda Síochána at other points of entry.
