Shimon Dovid Cowen (born 7 September 1951) is an Australian rabbi and academic.
He is known for his research on, and advocacy for, the Noahide Laws, on the basis of which, he has publicly opposed homosexuality, freedom of choice regarding abortion and euthanasia.
He is affiliated with Chabad Hasidism, a branch of ultra-Orthodox Judaism, and is the son of the former Governor General of Australia, Sir Zelman Cowen.