Mark Biltz (born June 25, 1956) is an American Christian pastor and author. His theories correlate solar and lunar eclipses with biblical prophecy, and he has published several books on the topic. He is the Washington state director of Christians United for Israel. He began writing about the "blood moon" tetrad phenomenon in 2008, and has come to be known as "the blood moons pastor" or "Blood Moon Biltz". His writings correlate lunar and solar eclipses with the modern State of Israel.