Everything from housekeys to passports have been found after this year's festival.
House keys, passports, and bankcards are among the items that are to be collected from the Fleadh's Lost and Found office.
It will be open from 9am until 5pm each day for the next seven days, after that, unclaimed possessions will be handed to Mullingar Garda Station.
The attendance at this year's festival is thought to have topped last year's in the same town and exceeded 600,000.
Items can be collected by appointment, and the office can be contacted through info@fleadhceoil.ie.
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