Authorities say the juvenile suspect was taken into custody on Tuesday in Pleasantville, New Jersey, and faces a number of charges.
The 15-year-old victim was stabbed on the 1000 of the boardwalk on May 25.
He was treated for non-life threatening injuries.
Video showed the chaos unfolding and the police apprehending several teens.
Teen stabbed during altercation on Ocean City, NJ boardwalk