The far-right politician, who governed Brazil between 2019 and 2022, was found guilty on five counts by three members of a five-justice panel.
Just one of the five judges has acquitted Bolsonaro and when the final one has voted, the panel will decide on the former president’s sentence – which could amount to decades in prison.
The 70-year-old, who has denied any wrongdoing, is currently under house arrest.
His lawyers have said they will appeal the verdict.
The ruling will deepen political divisions in Brazil and is also likely to prompt a backlash from the United States government.
Bolsonaro ally Donald Trump has already called the case a “witch hunt”, slapped Brazil with tariff hikes and revoked US visas for most members of Brazil’s high court.
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