The verdict was handed down more than four years after complaints surfaced severe sexual offenses against his employees.
Katsav was convicted of raping and sexually abusing a former employee from the tourism ministry. He was also convicted of sexually harassing two other women from the president's residence.
The year-long trial took place almost entirely behind closed doors on Thursday morning.
The verdict came one year and a half after the start of his trial and 12 years after allegedly committing the first of the offenses with which he was charged.
The conviction means Katsav will face a minimum of four years in prison.
The 65-year-old Katsav resigned in 2007 and was replaced by Shimon Peres.
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