He can enroll in school and begin team activities immediately.
Green-Beckham, a 6-foot-6, 220-pound receiver, transferred from Missouri after catching an SEC-leading 12 touchdown passes and gaining 883 yards last season.
"We are pleased to welcome Dorial to the University of Oklahoma, where he is excited to continue his education and resume his playing career," Oklahoma coach Bob Stoops said in a press release Thursday. "Dorial understands the privilege and responsibilities of representing the Oklahoma Football program. He is a talented young man who is eager to get to work with the rest of our team in the classroom and on the field."
Green-Beckham, who was a freshman All-American with College Football News, finished his two-year stint at Missouri with 87 receptions, 1,278 yards and 17 touchdown catches. Green-Beckham was named the national player of the year in 2011 by Sports Illustrated, Parade Magazine and USA Today after setting a national prep record with 6,353 career receiving yards and 75 receiving touchdowns, including 119 receptions for 2,233 yards and 24 touchdowns as a senior.
While he will be no help this season, Green-Beckham gives the Sooners an unmatched athlete on the outside. When Green-Beckham begins full team activities next year, he could give Oklahoma the top receiver tandem in the country combining with junior standout Sterling Shepard.
Green-Beckham, who could also declare for the NFL Draft before ever taking a snap with the Sooners, was kicked off the team at Missouri in April after an incident at an apartment complex in Columbia, Mo. Charges never were filed in the incident, but Green-Beckham had previously been arrested for marijuana possessions.
"There are people here who will help me build a strong foundation," Green-Beckham said in a release by the University of Oklahoma. "I've disappointed myself and others in the past. I know that I have a lot of work to do and I'm ready to get started. OU is a great program and I feel privileged to be part of it. The university has made the expectations clear and I want to live up to them and be a positive part of the campus and team."