Facebook said it suspended more than 350 accounts and pages with about 1.4 million followers.
People connected to the government of Saudi Arabia have run a network of fake accounts to promote state propaganda, the social media giant said.
Countries in the Middle East have increasingly turned to social networking websites such as Facebook, Twitter.
Riyadh was accused of spreading disinformation following the murder of dissident journalist Jamal Khashoggi.
The Saudi government media office did not immediately respond to the report.
More than 90 percent of the content was in Arabic.