The jury on Wednesday found 40-year-old John White guilty of 11 counts of wire fraud and four counts of filing a false tax-related document.
He faces dozens of years in prison when he is sentenced in November.
He was indicted last April.
Prosecutors say White made unauthorized online bank transfers worth $2.1 million from Arenas' account.
Prosecutors say White used the money to buy sports cars and pay the mortgage on his home.
Arenas, a three-time NBA All Star, played 12 seasons for the Orlando Magic, Memphis Grizzlies, Golden State Warriors and Washington Wizards.
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ORLANDO, Fla. - A federal jury has convicted a former personal assistant of Gilbert Arenas of stealing more than $2 million from the former NBA basketball player.