Terence John Millin FRCSI FRCS LRCP (9 January 1903 - 1980) was a British-born Irish urological surgeon, who in 1945, introduced a surgical treatment of benign large prostates using the retropubic prostatectomy, later known as the Millin's prostatectomy, where he approached the prostate from behind the pubic bone and through the , removing the prostate through the retropubic space and hence avoided cutting into the bladder. It superseded the technique of transvesical prostatectomy used by Peter Freyer, where the prostate was removed through the bladder.