Two cases of giant hydrocele, having more than 1,000 ml of contents, are presented. The first patient was a 77-year-old man with the complaint of urination difficulty and a very swollen left scrotum of three years duration. Mild prostatic hypertrophy, mild renal dysfunction and hypertension were seen during hospitalization. A scrotal puncture gave 2,100 ml of serous fluid. Radical hydrocelectomy and plastic operation for surplus scrotal skin were done, and difficult urination improved markedly. The second patient was a 77-year-old man with the complaint of right scrotal swelling of fifteen years duration. He had developed pollakisuria and urination difficulty three years previously. When he was transferred our hospital on emergency due to engorgement, the diagnosis of giant hydrocele was made. Right orchidectomy was performed because of marked testicular atrophy and old hemorrhagic fluid of 1,200 ml. Urination difficulty and pollakisuria disappeared postoperatively.