Kenneth Robert "Ken" Sitzberger (February 13, 1945 – January 2, 1984) was an American diver. After 4 years of Chicago Catholic League Champion at Fenwick High School, competing in the 3 m springboard he won a bronze medal at the 1963 Pan American Games and a gold at the 1964 Olympics. In 1964, Sitzberger was trailing the teammate Frank Gorman after nine of the ten dives, but Gorman performed poorly on his last dive, while Sitzberger was nearly flawless.