| Roles | Competed in Olympic Games | |
|---|---|---|
| Sex | Male | |
| Full name | Mariusz•Siembida | |
| Used name | Mariusz•Siembida | |
| Born | 21 March 1975 in Puławy, Lubelskie | |
| Measurements | 188 cm / 75 kg | |
| Affiliations | Lublinianki | |
| NOC | Poland |
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 1996 Summer Olympics | Swimming (Aquatics) | Mariusz Siembida | ||||
| 100 metres Backstroke, Men (Olympic) | 12 | |||||
| 4 × 100 metres Medley Relay, Men (Olympic) | Poland | 7 | ||||
| 2000 Summer Olympics | Swimming (Aquatics) | Mariusz Siembida | ||||
| 100 metres Backstroke, Men (Olympic) | 20 |