Children will be able to travel for free on a range of public transport services from tomorrow for four weeks.
The National Transport Authority's 'Kids Go Free' scheme is being extended from two to four weeks this year.
It's expected to cover more than a million trips over the coming weeks.
The offer will run from tomorrow July 1st until Sunday 28th July.
It's available for Child Leap card holders aged between 5 and 18, as long as they have credit of at least 1 cent on the card when boarding.
Services covered by the scheme include Dublin Bus (excluding Airlink and Nitelink); Luas and DART; commuter rail services in Dublin’s 'Short Hop' zone and on the Cork to Cobh/Midleton train lines; and Bus Éireann services where Leap card machines are available (including buses in Cork, Limerick, Galway and Waterford cities).
Transport Minister Shane Ross said previous campaigns have been "hugely successful".
He said: “Local businesses, cultural events, and other attractions will benefit from this campaign as well.
"When families are saving money on public transport, they will have more freedom to enjoy everything Ireland has to offer in the summer.”
More information about the scheme is available on the Leap card website.