A 27-year-old Thai male was admitted with left groin pain and he felt that he lost his left testis three weeks after his motorcycle accident-car collision. He had not been diagnosed after four days of admission at the previous hospital. Surgical reduction was performed without acute and delayed complications after three months of follow-up. Traumatic testicular dislocation is an uncommon sequel of trauma usually related to straddle injury from motorcycle accidents. Diagnosis depends on the awareness of the physician of its possibility of occurrence. Physical examination is the most helpful in diagnosis. CT scan or Doppler ultrasound, if available, may be helpful in diagnosis, particularly locating the extrascrotal testicle and detecting testicular viability. Manual reduction is the treatment of choice for acute traumatic dislocation of testis. Open reduction is indicated for the delayed case, or if there are (1) difficulty in determining the integrity of dislocated testis, (2) possibility of torsion, (3) failure of close reduction, or (4) the minimal morbidity of an inguinal exploration.