Keith Adam Van Horn (born October 23, 1975) is an American former professional basketball player. Van Horn played for the New Jersey Nets, Philadelphia 76ers, New York Knicks, Milwaukee Bucks, and the Dallas Mavericks of the National Basketball Association (NBA).

A forward, Van Horn finished his college basketball career with the Utah Utes as the all-time leading scorer in the history of the Western Athletic Conference (WAC). He was a consensus first-team All-American in 1997. Van Horn was selected by the Philadelphia 76ers with the second pick in the 1997 NBA draft and was traded to the New Jersey Nets on draft night. He was named to the 1998 NBA All-Rookie Team. Van Horn played for the Nets from 1997 to 2002, leading the team in scoring in the 1997–98 and 1998–99 seasons, finishing fifth in the NBA in scoring in the 1998–99 season, and was a key member of the 2001–02 Nets' team that made the NBA Finals. He would also go on to play for the 76ers, the New York Knicks, the Milwaukee Bucks, and the Dallas Mavericks. Van Horn averaged 16 points and nearly seven rebounds per game during his NBA career.