Last night's winning Lotto ticket was sold at SuperValu in Knocklyon, Dublin 16.
The jackpot was worth €12.8 million - the largest jackpot of 2017 so far.
The winning ticket was a Quick Pick, while the numbers drawn were 2, 15, 19, 26, 37, 38 and the bonus number 39.
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The National Lottery is urging the winner to sign the back of the ticket, and contact their prize claims team on 01-836-4444.
Another winner will take home a prize of €179,034 after matching five numbers with the bonus in last night's draw.
That ticket was sold in SuperValu on the Abbeyleix Road in Portlaoise.