David Edward Plummer (born October 9, 1985) is a retired American competition swimmer who specialized in backstroke events.

At the 2010 FINA Short Course World Championships in Dubai, Plummer won a gold medal in the 4×100-meter medley relay for his contributions in the heats.

At the National Championships, he finished first in the 100-meter backstroke with a time of 53.10, upsetting the Olympic gold medalist Matt Grevers.

Plummer lost out his last chance of a gold medal in the 4x100-meter medley relay, when the team was disqualified for a false start in the final.

After winning sections for a third straight year with the Wayzata Trojans, Plummer accepted a position at the University of Minnesota Aquatics Center.