Mariusz Siembida (born 21 March 1975 in Puławy, Lubelskie) is a retired backstroke swimmer from Poland, who competed for his native country at two consecutive Summer Olympics, starting in 1996 (Atlanta, Georgia).

Mariusz Siembida
Personal information
Full nameMariusz Siembida
Nationality Poland
Born (1975-03-21) 21 March 1975 (age 49)
Puławy, Lubelskie
Height1.88 m (6 ft 2 in)
Sport
SportSwimming
Strokesbackstroke
ClubKS Lublinianka
Medal record
Men's swimming
Representing  Poland
World Championships (SC)
Silver medal – second place 1999 Hong Kong 50 m backstroke
Bronze medal – third place 1999 Hong Kong 100 m backstroke
European Championships (LC)
Bronze medal – third place 1997 Seville 4×100 m medley
Bronze medal – third place 1999 Istanbul 50 m backstroke
European Championships (SC)
Gold medal – first place 1996 Rostock 50 m backstroke
Gold medal – first place 1996 Rostock 100 m backstroke
Summer Universiade
Gold medal – first place 2001 Beijing 50 m backstroke
Bronze medal – third place 1997 Catania 100 m backstroke

A member of Lublinianka he is best known for winning the bronze medal at the 1997 European Swimming Championships in the men's 4×100 m medley relay, alongside Marek Krawczyk, Marcin Kaczmarek and Bartosz Kizierowski.

References edit