The 6-foot-4, 195-pound Harris, of Tampa, Fla., averaged 15.5 points, six rebounds and five assists, and shot 76 percent from the foul line during his senior year at Jesuit High School, helping lead his team to a Florida Class 5A state championship.
Bartow said the Buccaneers had followed Harris closely throughout the 2012-13 recruiting season.
"We targeted Devin early on and watched him throughout the year," Bartow said in a statement issued by the university athletic department. "He's a lead guard who is a great facilitator and can score the basketball. He's a great kid from a great high school program, and he's surrounded by a wonderful family. When you think of student-athlete, he would be it in every sense of the word."
Harris' brother Ramon played at Kentucky from 2006-10.
"I am pretty certain that I have not coached a better overall basketball player than Devin Harris," Jesuit High coach Neal Goldman said in the statement. "The great players care, the great players strive for perfection, the great players know how to take their level of play to another gear when the game is on the line, and the great players have the ability to draw the best out of their teammates. That great player for us was Devin Harris."
Harris joins a pair of new Buccaneers already signed to the 2012-13 recruiting class, a group that includes Maurice O'Field (Cleveland, Ohio) and A.J. Merriweather (Jackson).