Up €90m in lottery prizes and jackpots has gone unclaimed over the past five years.
Last year alone nearly €17m in prizes was never claimed.
Among the unclaimed windfalls was a €250,000 ticket, sold in Gorey, Co Wexford, in April, 2011.
Winners have 90 days after the draw to collect their prize.
The largest unclaimed prize ever is a jackpot of €3.4m from June 2001. The winning ticket was sold in Coolock in Dublin.