Mariusz Podkościelny (born April 29, 1968) is a former freestyle swimmer from Poland, who, twice competed at the Summer Olympics: in 1988 and 1992.

He is currently the head coach for the swim team and teaching history at Pine Crest School in Fort Lauderdale, Florida.

In the preliminary round for the 400m, he set the Olympic Record, which he held for about 10 hours.

[1] Mariusz married Dagmara, also Polish, and had a daughter named Julia.

This biographical article related to a Polish swimmer is a stub.