The wearing of face coverings in retail settings becomes mandatory from today.
Anyone who refuses to wear one will face fines of up to €2,500 and time in prison.
The rule will not apply to children under 13 or anyone who can't wear one due to physical or mental incapacity.
Retail staff will be required to wear one unless there's a partition or space of two metres between them and customers.
Retailers will have the power to call Gardai over non-compliance.
It comes after regulations to enforce the compulsory wearing of face coverings on public transport came into effect last month.