Ryszard Antoni Marczak (born 25 November 1945 in Gdynia, Pomorskie) is a Polish former long-distance runner who represented his native country at the 1980 Summer OlympicsinMoscow, USSR. He set his personal best (2:11:35) in the classic distance in 1981.
| Year | Competition | Venue | Position | Event | Notes |
|---|---|---|---|---|---|
Representing  Poland
| |||||
| 1980 | Olympic Games | Moscow, Soviet Union | — | Marathon | DNF |
| 1981 | New York City Marathon | New York, United States | 5th | Marathon | 2:11:35 [1] |
| 1982 | European Championships | Athens, Greece | 7th | Marathon | 2:17:53 |
| New York City Marathon | New York, United States | 4th | Marathon | 2:12:44 | |
| 1983 | World Championships | Helsinki, Finland | 16th | Marathon | 2:13:20 |
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