Student demonstrations have surged along with protests by others. Members of civic groups, clergy, business leaders and artists who oppose Aristide joined Wednesday's march.
"The signal we're sending today is that we want another Haiti," said Andy Apaid Jr., a businessman and prominent Aristide critic.
Tensions have been rising in the Caribbean country since Aristide's party swept disputed 2000 elections.
The opposition refuses to participate in elections unless Aristide steps down, but he plans to serve out his elected term until 2006.
Haitian sociologist Laennec Hurbon, who as a student fled to Paris under Francois "Papa Doc" Duvalier, said unlike past university students who were wealthier and against widely unpopular governments, the students today come from poor families who helped propel Aristide to power.
"Haiti has its own rhythm," said Hurbon. "To know the future, you must know its past, and the students have been a very important part of the past."
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