Samuel Anthony Alito Jr. is an American jurist who serves as an associate justice of the Supreme Court of the United States. He was nominated to the high court by President George W. Bush on October 31, 2005, and has served on it since January 31, 2006. After Antonin Scalia, Alito is the second Italian American justice to serve on the U.S. Supreme Court.

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.