Zimbabweans are voting in fiercely contested presidential and parliamentary elections which have already been hit by fraud allegations.
President Robert Mugabe, 89, has said he will step down after 33 years in power if he and his Zanu-PF party lose.
Prime Minister Morgan Tsvangirai’s Movement for Democratic Change (MDC) have accused Zanu-PF of doctoring the electoral roll, a charge it has denied.
Campaigning was mostly peaceful, with few reports of intimidation.
Zanu-PF and the MDC have shared an uneasy coalition government since 2009 under a deal brokered to end the deadly violence that erupted after a disputed presidential poll the previous year.
Mr Tsvangirai won the most votes in the first round, but pulled out of the run-off with Mr Mugabe because of attacks on his supporters.
‘Determined to vote’
The government has barred Western observers from monitoring Wednesday’s elections, but the African Union (AU) and the Southern African Development Community (Sadc), as well as local organisations, have been accredited.