The president's former lawyer had pleaded guilty to charges including breaking campaign finance laws, lying to Congress, and tax fraud.
Michael Cohen is to be sentenced next week and may face several years in prison.
The president’s former lawyer will be sentenced on December 12.
The president defended his record saying "I tell you what - if I ever got impeached then I think the markets would crash.”
The president’s former lawyer pleaded guilty to eight charges, including campaign finance violations.
The jury deliberated for four days before announcing the verdict at the federal courthouse in Alexandria, Virginia.
Prosecutors had been investigating Mr Cohen for possible fraud related to his businesses for months.