Harris, a 6-foot-2, 170-pound point guard out of Raleigh (N.C.) Word of God, announced his pledge via Twitter just following a weekend office ial visit to Missouri's campus.
Harris took his official visit with recent Missouri pledge Michael Porter and five-star uncommitted forward Kevin Knox.
Prior to his commitment to Missouri, Harris was committed to Washington, but he opted to back off of his pledge when Lorenzo Romar was let go at Washington.
With the addition of Harris to Missouri's 2017 recruiting class, Cuonzo Martin now has a trio of recruits in the fold. Harris joins Porter, a five-star prospect whose father is now an assistant coach on staff, and CJ Roberts.
Harris is regarded as a three-star prospect on Scout.