| Roles | Competed in Olympic Games | |
|---|---|---|
| Sex | Male | |
| Full name | Marian•Siejkowski | |
| Used name | Marian•Siejkowski | |
| Born | 29 August 1940 in Poznań, Wielkopolskie |  POL |
| Died | 31 October 1990 (aged 50 years 2 months 2 days) in near Poznań, Wielkopolskie | POL |
| Measurements | 196 cm / 96 kg | |
| Affiliations | AZS Wrocław — Wrocław, Dolnośląskie | POL |
| NOC | Poland | POL |
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 1964 Summer Olympics | Rowing | POL |
Marian Siejkowski | |||
| Coxed Pairs, Men (Olympic) | Poland | 6 | ||||
| 1972 Summer Olympics | Rowing | POL |
Marian Siejkowski | |||
| Eights, Men (Olympic) | Poland | 6 |
