The five-star prospect out of Richmond (Tex.) George Bush opted to stay local and play for Rick Barnes and the Texas Longhorn.
Ridley, a 6-foot-9, possibly 6-foot-10, 255-pound center, made his decision early Friday morning. Houston Hoopstars coach Keith White confirmed the news to Scout.com.
"Cameron has committed to Texas," White told Scout.com.
Over the summer Ridley emerged as a national prospect and received interest from coast-to-coast. Among the heavily involved schools were Baylor, Kansas, North Carolina, Oklahoma and Texas A&M.
Ridley is ranked the No. 4 prospect in the nation and the No. 3 center in the 2012 class.