From BBC News:
Noor Salman, 31, was charged with obstruction of justice and aiding Omar Mateen in providing support to the Islamic State militant group.
Her lawyers had argued that she was an innocent victim of her husband's lies.
Mateen killed 49 people at the Pulse nightclub in June 2016 before he was shot dead by police.
Who was the Orlando club gunman?
The 12-member jury returned their verdict on Friday morning on their third day of deliberations.
Ms Salman sobbed as the verdict was read while her relatives hugged, according to the Orlando Sentinel.
Defence lawyer Charles Swift had said in his closing argument: "She doesn't go to the mosque, she searches for Hello Kitty on her website.
"We're supposed to believe she had long conversations with Omar Mateen about jihads?"
Her attorneys also argued she was a victim of a "tragic marriage" to Mateen, with no prior knowledge of the attack.
Mateen, a US citizen who had been known to the FBI since 2013, entered the venue after midnight and opened fire with an AR-15 assault rifle, holding people hostage in the bathroom before dying in a gun battle with police.
His father, Seddique Mateen, said a possible motive for the attack might have been his son's outrage at seeing two men kissing in Miami.
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