* The Gospel of Judas (1995)
* The Seventh Scroll (1998)
* The House of Wisdom (2000)
* Shadows of the Pope (2002)
* Jerusalem (2004)
* The Palace (2007)
* The Cave of Secrets (2009)
* The Last Templar (2011)
* The Medici Secret (2014)
* The Book of the Most Precious Substance on Earth (2017)
Non-Fiction Books:
* Secret Places, Hidden Sanctuaries: Uncovering Mysterious Sites around the World (2003)
* The Secrets of the Vatican (2005)
* The Real History of the Bible: From Moses to the Messiah (2011)
* 1000 Years of Secrets: From the Crusades to the Renaissance (2012)
* The Forbidden Gospels (2015)
* The Real History of Mary Magdalene: From the Bible to the Present Day (2016)
Short Stories and Articles:
Kelemen has written short stories and articles for numerous publications, including The New Yorker, The Wall Street Journal, The Washington Post, and National Geographic.