Williamson averaged 22.6 points and 8.9 rebounds per game this year while guiding the Blue Devils to an appearance in the Elite Eight.
Williamson was the AP Player of the Year, Naismith Award victor and Wooden Award victor among his many accolades this season.
The freshman from Spartanburg, South Carolina made the announcement on his Instagram page.
The Atlanta Hawks are the only other team with better than 10 percent odds at getting the No. 1 pick. Barrett and Cam Reddish in the NBA Draft, as the fourth freshman, Tre Jones, announced that he will be returning to Duke for his sophomore season.
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The NBA Draft Lottery is just less than a month away (May 14) and the draft will take place in June.
Williamson is expected to be the No. 1 pick in the draft.
Now, all that needs to be determined is who exactly will be picking first overall. There are some questions about what position he'll play in the National Basketball Association as he combines the size of a forward (6-foot-7) with the build of a centre (285 pounds), but he's one of the most explosive and powerful prospects we've ever seen.