Ruling on accusations of fraud made by rival candidates after elections in November, the panel said while there were irregularities in the polls there was no massive fraud and the electoral process had not been affected.
Moise, who won just over 55 percent of votes cast, is expected to be sworn in as president before early February.
The 48-year-old is a first-time candidate who beat more than 20 other rivals for the post of president.
He told supporters: “This presidential mandate of five years entrusts in me all the freedoms of the people, and as I said in my campaign the power comes from God, through the voice of the people.”
Moise, who ran for ex-president Michel Martelly’s PHTK party, has promised to tackle corruption in Haiti and bring about national unity.
Some rival groups had vowed never to accept his win in the election.
Moise won a ballot in October 2015 but that was scrapped over accusations of fraud.
The businessman now has the difficult task of propping up Haiti’s economy and
overseeing reconstruction after a devastating earthquake and hurricane. (Seamus Kearney - Euronews)