David Palmer McCagg (born March 13, 1958) is an American former competition swimmer, world champion, and world record-holder. He was the 100 metres freestyle champion at the 1978 World Aquatics Championships in West Berlin.

McCagg graduated from Cypress Lake High School in 1976. He was a student at Auburn University,^[1] where he swam for the Auburn Tigers swimming and diving team.

He won four gold medals at the 1978 and 1982 world championships, and another three gold medals at the 1979 Pan American Games.^[2]

McCagg currently resides in Florida. He runs a company that develops devices to assist swimmers.

• List of Auburn University people
• List of World Aquatics Championships medalists in swimming (men)
• World record progression 4 × 100 metres freestyle relay

• Auburn Men's Swimming & Diving All-Time All-Americans
• Harvard Men's Swimming & Diving
• GMX7 Training: X-1 Pro