The national stamp price will increase from €1.25 to €1.35 from the first of February.
An Post says the 10c price hike is due to persistent cost inflation across transport, fuel, energy and operations.
The standard worldwide letter stamp will remain at €2.20 and the Digital Stamp will stay at €2.
Garrett Bridgeman, Managing Director of An Post Commerce said.
“There has been very significant input cost inflation across our business, most particularly in fuel at 25% this past year, and energy at more than 60%. We have made every effort to minimise the necessary price increases by spreading them across our products and services while working to ensure top quality, sustainable services for all customers, regardless of where they live.
"We will continue our huge transformation with innovative new Letter products and services for the future. Through innovations such as our world-first Digital Stamp with notified delivery, we will protect our customers and support Irish firms who are doing business at home and expanding across the globe, while ensuring safe, decent work for our staff.
“While these increases are necessary to cover rising costs and ensure service continuity on par with the best in Europe, we are alleviating the impact on SMEs and personal customers by providing discounts to them and offering regular price promotions through the year at post offices and online.
“I am pleased to confirm that our Community Focus supports including free postage to all nursing and care homes across Ireland and free newspaper delivery for older customers will be available throughout 2023”.