Williams, a 6-3, 215-pound quarterback, chose UNC over finalists Michigan and Virginia Tech.
He says he also received scholarship offers from Boston College, East Carolina, Florida, Kansas, Kansas State, LSU, Louisville, NC State, Notre Dame, South Florida, Syracuse, UCLA and Wake Forest.
"I feel good about choosing UNC-Chapel Hill because it's a good fit for me," said Williams, who plans to major in sports broadcasting and boasts a 3.0 GPA at Mallard Creek. "The coaches are great and I love the atmosphere on campus. Also, staying in North Carolina is important to me."
Williams is rated a four-star prospect and the nation's No. 15 quarterback by Scout.com. Inside Carolina's Don Callahan ranks Williams the No. 4 overall prospect in the state of North Carolina.
Williams is North Carolina's second highly regarded quarterback commitment for its 2011 class, joining Myrtle Beach (S.C.) High's Everett Golson.
Last season in Mallard Creek's spread offense, Williams accounted for 40 touchdowns, while accumulating roughly 2,400 yards passing and 1,000 rushing yards.
He is the cousin of former Tar Heel Robert Williams.