When the verdict was read, Stone faced the jury of nine women and three men, and showed no outward signs of emotion as he was pronounced guilty.
Prosecutors put forward emails and texts that they argued show Stone lied to the House Intelligence Committee about having Wikileaks-related communications that he didn't turn over to Congress.
He has been a friend of Trump for decades.
Stone was convicted of all seven counts in a federal indictment that accused him of lying to Congress, tampering with a witness and obstructing the House investigation into whether the Trump campaign co-ordinated with Russian Federation to tip the 2016 election.
Coming full circle, former Secretary of State Hillary Clinton - Trump's 2016 opponent - chimed in, accusing the president of a crime.
"A double standard like never seen before in the history of our Country?".
NBC News' report added that Stone is scheduled to be sentences in February, and he faces up to 20 years in prison.
Stone, 67, was convicted on charges that include obstruction, making false statements and witness tampering.
During the six-day trial, the government presented emails, text messages and Stone's own public statementsto try to prove its case that Stone had lied to Congress to hide his efforts to contact WikiLeaks - including by telling lawmakers that he had no records concerning hacked emails or the anti-secrecy group.
Stone declined to comment as he left the courthouse.
Such subterfuge, the DOJ alleged, prompted congressional investigators to issue an incomplete and inaccurate report about Russian interference in the 2016 USA presidential election.
Stone had told lawmakers that Credico was his "back channel" to WikiLeaks when it was actually the conspiracy theorist and author Jerome Corsi. He did not take the stand during the trial and his lawyers did not call any witnesses in his defence.
Stone, a close Trump ally who famously has the face of former president Richard Nixon tattooed on his back, was also accused of tampering with a witness, Credico, when Credico was summoned to testify before Congress and speak with the Federal Bureau of Investigation.
Stone was apparently their intermediary, according to prosecutors. Stone had been banned from Twitter after inflammatory posts in 2017.