David Hackett Souter is an American lawyer and jurist who served as an associate justice of the U.S. Supreme Court from 1990 until his retirement in 2009. Appointed by President George H. W. Bush to fill the seat that had been vacated by William J. Brennan Jr., Souter sat on both the Rehnquist and the Roberts courts.

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.