Walter Ray Allen Jr. (born July 20, 1975) is an American former professional basketball player who played 18 seasons in the National Basketball Association (NBA). After playing three seasons of college basketball for Connecticut, Allen entered the NBA in 1996 and went on to play for the Milwaukee Bucks, Seattle SuperSonics, Boston Celtics and Miami Heat. One of the most accurate three-point and free throw shooters in NBA history, he was a ten-time NBA All-Star, and won two NBA championships (2008, 2013). He also won an Olympic gold medal as a member of the 2000 United States men's basketball team. Allen is the NBA's all-time leader in career three-point field goals made in both the regular and postseason. He has acted in two films, one of which was a lead role in the 1998 Spike Lee film, He Got Game.

The third of five children, Allen was born at Castle Air Force Base near Merced, California, the son of Walter Sr. and Flora Allen. A military child, he spent time growing up in Saxmundham in England, Altus in Oklahoma, Edwards Air Force Base in California, and Germany. He attended high school in Dalzell, South Carolina, where he led Hillcrest High School to a basketball state championship.