Demonstrators gathered along a major street up to the Arc de Triomphe.
There were scuffles and police fired tear gas as the protest spilled over onto the Champs Elysees, the avenue which runs past the president's palace.
France's Senate is due to debate the bill next month after it was passed by the lower house of parliament.
President Francois Hollande's Socialist Party and its allies dominate both houses.
Opinion polls suggest a majority of French people still support gay marriage but their numbers have fallen in recent weeks.
Banners unfurled along the march route included "Hands off my filiation" and "We want work, not gay marriage".
Police had banned the protesters from the Champs Elysees, but groups of them broke through to the avenue.
Police used batons and tear gas to try to dislodge several hundred people who gathered there as the main demonstration ended.
Interior Minister Manuel Valls said the remaining protesters were mostly from far-right groups.
However, the head of the centre-right opposition UMP party, Jean-François Cope, said some families on the protest had been caught up in the teargas.
Source: BBC
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