It means all non-essential retail will close, only essential workers should travel to work and gyms and hairdressers will close.
The entire country has also been placed on an enhanced level three, where all visits to homes or gardens are banned with some essential exemptions.
Only up to 6 people from two households can meet outdoors and the exemptions allowing club championships to continue have been removed.
Taoiseach Micheál Martin says there will also be more of a focus on working from home:
