He's the first former US president to return to the office in more than 130 years - and the oldest man ever elected to the role.
Donald Trump's stunning victory over Democratic nominee Kamala Harris also makes him the first presidential candidate to win the keys to the White House as a convicted felon.
The 78-year-old has told his supporters that what is coming will be "the golden age of America" and he has vowed to "heal the country".
But what will really be the impact of his victory on America, us here in Ireland and the world generally?!
'Deise Today' this morning (Thursday) got the view of Gerry Arthurs who is a Lecturer in Politics and International Relations at SETU.
You can listen back to his chat with Maria McCann by clicking on the image above...
