He could face up to 42 years in prison.
The lawyer was accused of seeking to extort more than $20m (£15m) from Nike.
On Friday, a jury in NY convicted the lawyer, who is best know for once representing Stormy Daniels, on all three counts; attempted extortion, honest services wire fraud and transmission of interstate communications with intent to extort.
Citing previous testimony and text messages between Auerbach and Franklin, defense attorneys said the two men were after "justice" and hired "Avenatti to be Avenatti" to get it.
Prosecutors said he had more than $11 million in debts at the time. "While the defendant may have tried to hide behind legal terms and a suit and tie, the jury clearly saw the defendant's scheme for what it was - an old fashioned shakedown". Trump has denied any such encounter took place. At his peak of notoriety, Avenatti used Twitter and TV appearances to relentlessly criticize Trump and even considered running for president himself.
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The verdict marks a victory for the Manhattan U.S. attorney's office, which brought the case past year following a swift investigation. He sought $1.5 million for Franklin, as well.
Gary Franklin, the youth basketball coach who Michael Avenatti represented, testified last week that he was bullied by Nike executives who forced him to make the illicit payments to top high school basketball players and their families.
Avenatti showed no reaction as the verdict was read. He looked straight ahead with a sad expression.
Mr. Avenatti's lawyers pointed the jury to evidence that the coach had authorized Mr. Avenatti to be tough in discussions with Nike. In exchange for keeping quiet, Avenatti told the lawyers they would have to pay him and another attorney $12 million and guarantee between $15 million and $25 million in payments for an internal investigation, they said.
Sentencing is set for June 17.
He'll go on trial again in April on NY charges that he stole a book advance intended for Daniels, who fired him.