Nathan D. Clements (born December 12, 1979 in Shaker Heights, Ohio) is an American football cornerback for the San Francisco 49ers of the National Football League. He was drafted by the Buffalo Bills 21st overall in the 2001 NFL Draft. He played college football at Ohio State.

Clements went to Shaker Heights High School. Clements excelled at both defensive back and quarterback and was named an All-American by USA Today, Blue Chip Illustrated and Super Prep.

Clements was also named first team All-Ohio during a season in which he had seven interceptions, including one returned for a touchdown. He also returned two kicks for touchdowns. Clements led the Raiders to a playoff berth in 1997 and led them past a Euclid Panther team that featured Notre Dame back Tony Fisher. Clements also holds the Shaker record for career interceptions with 14. The school retired his number 20 jersey in 2005.