Residents of Bounti, in the central Mopti region, said a helicopter opened fire on the ceremony on Sunday.
The French military, which has troops in the region, said it carried out a strike on jihadist militants in central Mali, but that no wedding was involved.
Five French soldiers have been killed in attacks in Mali in recent days.
On Tuesday, France said a military operation - involving an airstrike and carried out after detailed research and days of tracking individuals - had killed dozens of Islamist insurgents in the region.
A spokesman for the French military, who was not named, told AFP news agency that "reports relating to a wedding do not match the observations that were made".
How West Africa is under threat from Islamist militants
Why France is focused on fighting jihadists in Mali
Is Africa overtaking the Middle East as the new jihadist battleground?
World's most dangerous peacekeeping mission
Villagers in Bounti said a low-flying helicopter, which has not been identified, carried out the strike in broad daylight.
Ahmadou Ghana said two of his brothers were killed. "It was run for your lives," he said, according to AFP.
On Saturday, two French soldiers were killed while collecting intelligence when their armoured vehicle was hit by an improvised explosive device in Mali's eastern region of Menaka, the French presidency said.