Testicular torsion, one of the most common pediatric urological emergencies, is rarely familial. This study deals with the sixth recorded family with familial testicular torsion and the effects on the spermatogenesis and the appearance of testicular autoantibodies in three affected subjects (two brothers, aged 18 and 15 years, and their father, aged 48 years). The father and one of the brothers, who had peripubertal unilateral testicular torsion, presented normal fertility and oligozoospermia, respectively. The other brother, who had a history of bilateral testicular torsion, did not present pubertal development until he was 18 years old and he needed substitutive testosterone therapy. Sperm autoantibody titer increased only in the two cases with unilateral torsion and remained unmodified at a 5-year follow-up. The results indicate that testicular torsion can cause variable degrees of spermatogenesis impairment and induce development of autoantibodies against spermatozoa and gonadal antigens. The persistence of fertility in the father and the progressive spermatogenesis recovery in one of the affected sons suggest that the damaging effects of these autoantibodies deserve further investigation.