All eight defendants have been found guilty over the July 2016 lorry attack in the southern French city of Nice in which 86 people were killed.
Seven men and a woman were sentenced by a special court in Paris to jail terms ranging from two to 18 years.
Three were convicted of association with a terrorist, while five others were found guilty of supplying weapons.
The attacker, Mohamed Lahouaiej-Bouhlel, was shot dead after driving a lorry into crowds on Bastille Day.
