Saturday's winning Lotto ticket was bought at Spar on Upper O'Connell Street.
The National Lottery says the winner of the €10.2m jackpot has already come forward.
A National Lottery spokesperson said the winner will "spend the coming days getting independent legal and financial advice".
The owner of the winning Spar store said he was "absolutely delighted" for "whoever the winner is".
Barry Thomspon, who took over the shop in 2008, said it is "the biggest ever National Lottery win we have had".
He said the store has a mix of regular, business and tourist customers.
The win comes the same week a large family syndicate from North Dublin scooped €175m on the EuroMillions.
National Lottery CEO, Dermot Griffin, said:
"This has been an extraordinary few days in the 32 year life of the National Lottery".
