Jiří Pták (born 24 March 1946 in Děčín, Czechoslovakia), is a Czech rowing coxswain who competed for Czechoslovakia at six Olympic Games between 1968 and 1992 (except the 1984 Olympics, boycotted by the Eastern Bloc countries). He was the first rower to compete at six Olympics. He was the third rower, after Briton Jack Beresford and Soviet Yuriy Lorentsson, to compete at five Olympics. (From 1896 to 2020, 26 rowers have competed at five Olympics and 8 at six Olympics.) His best performance was fourth in the eight at the 1980 Moscow Olympics, when his team lost out on bronze by 1.09 seconds.