Dislocations or fractures of the limbs can arise from muscle contraction during epileptic seizures. Dislocation complication of the bilateral temporomandibular joint from seizures is reported very rarely. A 36-year-old woman, who had no history of epilepsy, presented recurrent dislocations of the bilateral temporomandibular joint and generalized tonic-clonic seizures. EEG showed intermittent generalized slow activity. We report a case of bilateral temporomandibular joint dislocation that occurred during generalized tonic-clonic seizures, which has not previously been reported in Korea.