The mystery winner comes from the Donegal Town area but their identity has still not been made public.
The lucky ticket was bought in the local post office using a €4 quick pick.
The winning numbers were 2,14, 22, 24, 29 and 41 with 44 being the bonus ball.
The latest win comes just weeks after Greencastle grandmother Kathleen McLaughlin scooped €2.6 million.
A spokesman for the National Lottery said “There is a lot of speculation as to who the winner is but we cannot say at this stage.
“If the winner wants to go public then we will arrange for their identity to be known but that is not the case right now.
“Donegal would seem to have a lotto luck at the moment with two big wins in December.”
Keep logging on to Doneagdaily.com as we go in search of the lucky winner!