Asher Raby (Hebrew: אשר רבי; born 1946) is an Israeli serial killer. A mentally-ill religious fanatic, he killed five people in several attacks committed across the country from March to November 1979, with the most prominent of them being Philoumenos Hasapis, the Greek Orthodox hegumen of Jacob's Well. Deemed unfit to stand trial for his crimes, he was acquitted by reason of insanity and confined to a psychiatric facility.