April Benayoum, who competed for the Miss France title in December, became the subject of hate messages after saying at the event that her father is of Israeli origin.
The anti-Semitic messages were posted mainly on Twitter and drew condemnation from politicians and associations.
On Wednesday, a Paris court ordered seven defendants, four women and three men, to each pay fines ranging from €300 to €800.
An eighth suspect was acquitted, with the court finding that his tweet did not target Benayoum directly.
During the trial, the suspects all admitted to publishing the messages, but denied they were anti-Semitic, with some arguing they were making a political statement defending the cause of the Palestinians.
But the court found that the posts expressed “a rejection of a person because of their origins” or “because of their presumed religion” and that they targeted Benayoum directly.
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The seven were also told to pay €1 in damages to the contestant and to several associations against racism and anti-Semitism that had joined the plaintiffs.
Four of them were also told to attend a two-day civics class having, according to the court, not fully grasped the seriousness of their actions.
While calling the penalties “light”, Jean-Louis Lagarde, a lawyer for the MRAP anti-racism association, said they were still “educational”.
The judgment showed that “you can’t hide behind the internet, or behind Twitter”, he said.
Benayoum’s lawyer Jean Veil said he blamed Twitter itself because the messaging platform had allowed the offensive tweets to remain visible for several days.
“My client believes that Twitter’s negligence is to blame in this case,” Veil said, adding that a separate case had been brought against the platform.