The main demonstration saw three separate processions converging on the Invalides esplanade, filling the huge promenade with pink and blue -- the official colours of the anti-gay marriage movement.
Police yesterday said 150,000 people turned out to protest, a figure immediately contested by organisers of the demonstration who said one million opponents of the law had shown up.
By early evening, no incidents had been reported despite the presence of far-right activists, some of whom briefly unfurled a banner at the ruling Socialist party's headquarters urging President Francois Hollande to resign.
Police said they arrested 96 people and used tear gas to fight off the troublemakers.
The youths shouted slogans against the government such as "Socialist dictatorship" and also threw objects at journalists covering the event.
Late Saturday, police had detained 50 people involved in an anti-gay marriage protest on the busy Champs-Elysees avenue.
Fears of unrest at yesterday's protest had been fuelled by violence that erupted earlier this month during celebrations marking football club Paris Saint-Germain's league victory that saw tourists attacked and shop and car windows smashed.
Interior Minister Manuel Valls had warned that so-called "ultras" many of them far-right nationalists were expected to infiltrate the protest and cause unrest, and advised parents not to bring their children with them.
But those in the protest ignored the recent tensions, bringing their children along as others had in previous demonstrations.
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