The Santa Ana, California, prospect had been originally committed to Oregon, but decommitted and now lands with the Sooners.
The decision comes at a time when Oklahoma still has not named a defensive coordinator, and Criddell is slated to play defensive back.
The 6-foot, 188-pound athlete said he wasn't concerned about the defensive coordinator position still being open and that he was confident it would be filled soon.
Oklahoma now has the No. 9-ranked recruiting class overall with 10 ESPN 300 commitments.