A banned demonstration near a migrant camp in Calais on Saturday left three police officers and a journalist lightly wounded, a news report said.
Police used water cannon and tear gas against well over a hundred protesters, consisting of migrants and pro-migrant activists from across France, La Voix du Nord newspaper reported.
The demonstrators reportedly threw stones at police.
The local authorities had earlier this week issued an order forbidding any migrant-linked demonstrations.
The government in Paris wants to shut down the camp, which officials say holds about 7,000 migrants. Aid organizations put the number at closer to 10,000.
The migrants are waiting in the camp to try and reach Britain, often stowed in, behind, or underneath trucks.