The owner of a winning lottery ticket has only hours left to claim a £68,216 prize from September.
Tickets for the draw can be bought in nine European countries
The deadline to claim the EuroMillions cash prize is 1730 GMT on Wednesday.
The person who bought the ticket in the Bournemouth area for the 9 September draw has yet to come forward and claim the winnings.
The winning EuroMillions numbers were 8, 12, 19, 31 and 50. If the prize is not claimed before the deadline, then the cash will go to good causes.
A National Lottery spokesperson said: "We are urging everyone to check their tickets again and look in the pockets of coats, in their wallets, in bags and down the back of the sofa.
"There is a lucky winner out there, they just don't know it. We have the champagne on ice and our fingers crossed."
The EuroMillions draw is run by the National Lottery in conjunction with operators in eight European countries.
Three winners shared the latest jackpot of £126m. The winning tickets were bought in Portugal and France.