Prosecutors and witnesses described how sons pulled their father out of bed and chopped off his beard in the moonlight and how women surrounded their mother-in-law and cut off two feet of her hair, taking it down to the scalp in some places.
Prosecutors say hair was targeted because it carries spiritual significance in the faith.
The defendants face prison terms of 10 years or more at their Jan. 24 sentencing. Prosecutors plan to file a request Friday to revoke bond for defendants who had remained free pending trial.
All the defendants are members of Mullet's settlement, which he founded in Ohio.
Federal officials said the verdicts would send a message about religious intolerance.
"The victims in this case are members of a peaceful and traditional religion who simply wanted to be left to practice their religion in peace," U.S. Attorney Steven Dettelbach said. "Unfortunately, the defendants denied them this basic right and they did so in the most violent way."
Members of the Amish community who sat through the trial hurried into a hired van without commenting, some covering their faces.
Defense attorneys said the defendants were bewildered by the verdicts and said likely appeals would be based on a challenge to the hate-crimes law.
"They really don't understand the court system the way the rest of us have, being educated and reading newspapers," said Joseph Dubyak, whose client, Linda Schrock, has 10 children with her husband, who was also convicted.
Rhonda Kotnik, representing Kathryn Miller, said the verdicts would destroy Mullet's community of about 25 families. The defendants, including six couples, have a total of about 50 children, she said.
"I don't know what's going to happen to all their children," she said.
The suspects had argued that the Amish are bound by different rules guided by their religion and that the government had no place getting involved in what amounted to a family or church dispute.