The Taoiseach Micheál Martin announced on Tuesday that all religious worship and weddings can proceed at full capacity from Friday, October 22.
However, mask wearing and other protective measures will remain in place.
This is the first time Mass can be conducted at full capacity in the South since March 2020, while this has been the case since July 26 north of the border.
Announcing the changes in restrictions, Mr Martin said “we must double down collectively, as a society, in terms of protecting ourselves, in terms of how we behave in different contexts and different areas and that will be challenging in some situations”.
The Taoiseach said that the measures announced Tuesday will stay in place until February, under a recommendation from NPHET.
Mr Martin said the key point NPHET is making is that the protective measures include masks, hygiene and social distancing, where appropriate.