Fifteen patients underwent subcapsular orchiectomy with placement of an intracapsular testicular prosthesis for hormonal treatment of symptomatic Stage D carcinoma of the prostate. Serum testosterone decreased to castration levels, and the intracapsular prosthesis was often indistinguishable from a normal testicle postoperatively. This new technique of castration may be considered an alternative in those patients reluctant to undergo other forms of orchiectomy.