Neil Scott Walker (born June 25, 1976) is an American former competition swimmer, four-time Olympic medalist, and former world record-holder in multiple events.

[1] Walker represented the United States at the 2000 Summer Olympics in Sydney, where he won a silver medal in the men's 4×100-meter freestyle relay, and at the 2004 Summer Olympics in Athens, where he also won a bronze in the 4×100-meter freestyle relay.

He also twice earned gold medals in the 4×100-meter medley relay, after swimming for the winning U.S. team in the preliminary heats.

Walker retired from competitive swimming after the 2008 U.S. Olympic Trials.

He started a swim school with Olympian and former Longhorn teammate Ian Crocker and U.S. National Champion and former Longhorn teammate James Fike, with locations in Austin and Dallas.