The top Constitutional Court of Angola (CC) on Wednesday validated the election of Mr João Lourenço, the 63-year-old former Defence minister.
The petition filed by the opposition was thrown off-the window.
The president-elect succeeds Jose Eduardo dos Santos, whose 38-year-term ends on September 21 when the new president is sworn in.
Dos Santos party MPLA will now continue ruling the country since independence in 1975.
Reading the ruling, the head of the CC court Mr. Rui Ferreira called the election free, fair and valid.
“The August 23 election were free, transparent, universal and in accordance with the country’s Constitution and law, they are valid,” Mr Ferreira said.
He added that despite there being minor irregularities, the opposition’s concerns were not valid.
The elections were held on August 23rd and were the nation’s fourth since independence in 1975.