Last night's €11 million winning Lotto ticket was bought in Co Wicklow.
The jackpot was the 15th highest prize since the Lotto was launched in 1988.
The National Lottery is appealing to people in Wicklow to check their ticket and to get in touch if they have the lucky numbers - 10, 13, 23, 24, 25, 44 and bonus number 12.
A Lotto spokesperson said: "With a jackpot win of this amount, it is important that we take some time to inform the winning retailer and of course to give the winning ticketholder the time and space they need to let this truly life-changing win to sink in.
"If you are the lucky ticketholder please be sure to sign the back of the ticket, keep it safe and contact the National Lottery prize claims team."
🥳 LOTTO JACKPOT WINNER 🥳
Players in Co. #Wicklow check your tickets! A single ticket sold in the county has matched all 6 numbers drawn and won the €11,225,280 Jackpot in last night's #Lotto draw. 🎉
📲 Check tickets now online or in-app: https://t.co/cfhZo4iA1M pic.twitter.com/rHDKJTGwJW
— The Irish National Lottery (@NationalLottery) August 22, 2019