Kenneth Marshall Walsh (born February 11, 1945) is an American former competition swimmer for Michigan State University, a two-time 1968 Olympic gold medalist, and former world record-holder in three events.

Walsh was born in Orange, New Jersey, and grew up in Ponte Vedra Beach, Florida.

Walsh won the first of his two Olympic gold medals by swimming the anchor leg for the winning U.S. team in the men's 4×100-meter freestyle relay, together with teammates Zac Zorn, Stephen Rerych and Mark Spitz.

He won his second gold medal by swimming the final freestyle leg for the first-place U.S. team in the men's 4×100-meter medley relay, together with teammates Charlie Hickcox (backstroke), Don McKenzie (breaststroke), and Doug Russell (butterfly).

Wenden set a new world record in the event, eclipsing Walsh's previous mark from 1967.