The judge, Army Col. Denise Lind, deliberated for about 16 hours over three days before reaching her decision in a case that drew worldwide attention as supporters hailed Manning as a whistleblower. The U.S. government called him an anarchist computer hacker and attention-seeking traitor.
Manning stood at attention, flanked by his attorneys, as the judge read her verdicts. He appeared not to react, though his attorney, David Coombs, smiled faintly when he heard not guilty on aiding the enemy, which carried a potential life sentence.
When the judge was done, Coombs put his hand on Manning's back and whispered something to him, eliciting a slight smile on the soldier's face.
Manning was convicted on 19 of 21 charges, and he previously pleaded guilty to a charge involving an Icelandic cable. He faces up to 136 years in prison. His sentencing hearing begins Wednesday.
Coombs came outside the court to a round of applause and shouts of "thank you" from a few dozen Manning supporters.