Aaron J. Fink, M.D., (d. 1990) was a California urologist who had an overwhelming belief that male neonatal circumcision was ordained by the Bible and medically necessary.

According to Fink's son-in-law, Fink had a son who had a botched circumcision and corrective surgery, and then died at the age of four-years due to a brain tumour. Fink spent the rest of his life trying to justify his son's circumcision and the pain that he endured during the four years of his life.

Fink authored Circumcision: A Decision for Life, a pro-circumcision tract. He also promoted the theory that circumcision could prevent HIV infection, although he had NO medical evidence to support that hypothesis.