David Davis was an American politician and jurist who was a U.S. senator from Illinois and associate justice of the United States Supreme Court. He also served as Abraham Lincoln's campaign manager at the 1860 Republican National Convention, engineering Lincoln's successful nomination for president by that party.

An associate justice of the Supreme Court of the United States is a justice of the Supreme Court of the United States, other than the chief justice of the United States. The number of associate justices is eight, as set by the Judiciary Act of 1869.