Flexor tendon entrapment (FTE) is a rare and usually lately diagnosed complication of pediatric forearm fractures. In this case report, we present a case of a neglected ring and little finger flexor digitorum profundus (FDP) entrapment after closed reduction of both bone forearm fracture and treated five years later due to late diagnosis. A 20-year-old man presented to outpatient clinic with flexion contracture of ring and little finger that occurred after both-bone forearm fracture treated with closed reduction and long arm cast five years ago. On his physical examination, flexion contracture of ring and index fingers was thought to be due to entrapment of tendons at the level of forearm and surgically released. Five years after surgical treatment for FTE, the patient had full range of motions at both fingers. He had no additional complaint. In conclusion, FTE is a rare complication after both bone forearm fractures. It should be kept in mind in the treatment of both bone forearm fractures. Surgical treatment of FTE in late cases is an effective procedure with excellent results.