Ex parte Bollman, 8 U.S. (4 Cranch) 75 (1807), was a case brought before the United States Supreme Court.

Bollman held that the constitutional definition of treason excluded mere conspiracy to levy war against the United States.

[1] Erick Bollman and Samuel Swartwout were civilians who became implicated in the Burr-Wilkinson Plot.

In 1806, Wilkinson informed President Thomas Jefferson of the plot, ending whatever may have actually been planned.

Bollman and Swartwout attempted to recruit others into the plot, but these individuals informed the military, which promptly arrested them.