Thousands of anti-government demonstrators marched through Harare on Thursday, in the first rally since a deadly crackdown on an election protest in August.
Many protester showed their support for the Movement for Democratic Change (MDC) party leader Nelson Chamisa.
Addressing the crowd, Chamisa said: "The people have voted, the vote must count, the voice must count. You voted and that vote must be respected.
"We are not agreed on the president. There is a crisis of legitimacy. Mr Mnangagwa, yes, was confirmed by the constitutional court but we still have to resolve from a legitimacy point of view, the contestation around who was voted by the people".
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The MDC maintains that it was cheated of victory in the July 30 election, eight months after long-time leader Robert Mugabe was ousted.