Jon Ryan Schaffer (born March 15, 1968) is an American heavy metal musician. He is the rhythm guitarist and principal songwriter of the Florida-based heavy metal band Iced Earth, which he formed in 1985 under the name Purgatory. He is also the lead singer in his political side project Sons of Liberty and, until 2021, played guitar for Demons & Wizards, his collaboration with Blind Guardian frontman Hansi Kürsch.
In April 2021, Schaffer pleaded guilty to two crimes related to his participation in the storming of the United States Capitol.