Mark Deli Siljander (born June 11, 1951) is an American author and politician who served as a Republican U.S. Representative from the state of Michigan. He authored the book A Deadly Misunderstanding: A Congressman's Quest to Bridge the Muslim-Christian Divide. In 2008, Siljander was indicted on charges of money laundering, conspiracy and obstruction of justice. In 2010, he pleaded guilty to obstruction of justice and acting as an unregistered foreign agent. In 2020, President Donald Trump pardoned Siljander.