Protesters brandished signs yesterday calling on Canada, France and the United States to "help Haitians get rid of the leaders in power."
Opposition chiefs marched at the front of the demonstration down several streets of the capital before police dispersed the crowd using teargas.
"We want elections but we are asking that President Martelly and Prime Minister Laurent Lamothe first step down. The people do not trust these leaders to organise honest elections," said Turneb Delpe, a former senator.
But the various political parties are divided over the makeup of the electoral body, seen as subservient to the executive branch.
And the main opposition parties have rejected the deal setting up the polls, brokered by the first Haitian cardinal in the Catholic Church, Chibly Langlois.
Martelly and a dozen senators met for two days to try to defuse the crisis but they failed to reach agreement on potential new leaders at the Provisional Electoral Council.