Voting has closed in Angola’s third election since independence from Portugal in 1976.
Election observers quoted by the Associated Press said there had been some irregularities with reports of voters being unable to cast ballots at a number of polling stations.
Incumbent president Jose Eduardo dos Santos is expected to get another five years in the job.
He has been Angola’s head of state since 1979 without ever being directly elected to the post.
The main opposition candidate, UNITA leader Isaias Samakuva, argues that the polls were rigged and plans to contest the result.
Since a 27-year civil war ended a decade ago, Angola has been riding an oil boom to become the second largest producer in sub-Saharan Africa.
But many Angolans say that the spoils of that new found wealth have only benefited the ruling elite.