Peter Drake Rocca (born July 27, 1957) is an American former competition swimmer, Olympic medalist, and former world record-holder.

Rocca continued to swim after the Montreal Olympics—two years later he won the silver medal in the men's 100-meter backstroke event at the 1978 World Aquatics Championships in Berlin, Germany.

He represented the United States again at the 1979 Pan American Games in San Juan, Puerto Rico, winning the 200-meter backstroke.

In college competition, Rocca led a resurgence of the Golden Bears men's swim program, captaining and winning individual and the team titles his senior year in 1979.

At the 1984 U.S. Olympic Trials, he fell short of qualifying for the 1984 U.S. team, finishing fourth in the 200-meter and third in the 100-meter backstroke races.