Marcin Kaczmarek (born 25 June 1977 in Pisz, Warmià Âsko-Mazurskie) is a retired butterfly swimmer from Poland, who competed for his native country at the 2000 Summer Olympics in Sydney, Australia.
A member of AZS-AWF Gdaà Âsk he is best known for winning the bronze medal at the 1997 European Swimming Championships in the men's 4ÃÂ100 m medley relay, alongside Mariusz Siembida, Marek Krawczyk and Bartosz Kizierowski.