He was handed a four-year prison sentence on Wednesday, two of which are suspended, and fined $594,000 (500,000 euros).
The Senegalese was one of the most influential men in the sport and led the International Association of Athletics Federations (IAAF), now renamed World Athletics, from 1999-2015.
It is unclear whether he will spend any time in prison, given that he’s been under house arrest in Paris since 2015.
During the trial Diack reportedly denied all of the allegations.
CNN is trying to reach Diack’s attorneys for further comment.
Diack’s son, Papa Massata, was also sentenced to five years in prison and handed a $1.19 million (one million euros) fine for his role in the corruption.
Papa Massata, who fled France to Senegal after authorities opened the investigation, had always denied any wrongdoing.
CNN is trying to reach out to Papa Massata’s lawyers for further comment.
Both men have also been ordered to pay World Athletics $5.93 million (five million euros) in damages.