Almost 5.5 million registered to take part in the election expected to be a tight race between Conde and opposition leader Diallo.
Voters in Guinea have been casting their ballots in a high-stakes presidential poll taking place after months of bloody unrest.
Almost 5.5 million registered voters can vote on Sunday at roughly 15,000 polling stations.
Results are expected within 24 hours after voting closes at 6pm local time (18:00 GMT).
A candidate needs to secure more than 50 per cent of the vote to win.
Twelve candidates are vying for the highest office, but only the incumbent, Alpha Conde, and Cellou Dalein Diallo, the leader of main opposition party Union of Democratic Forces of Guinea (UFDG), are said to be in with a chance of victory.
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