Lambdin Purdy Milligan (March 24, 1812 – December 21, 1899) was an American lawyer and farmer who was the subject of Ex parte Milligan 71 U.S. (4 Wall.) 2 (1866), a landmark case by the Supreme Court of the United States. He was known for his extreme opinions on states' rights and his opposition to the Lincoln administration's conduct of the American Civil War.