| Roles | Competed in Olympic Games | 
|---|---|
| Sex | Male | 
| Full name | Mikhail Aliaksevich•Siamionau | 
| Used name | Mikhail•Siamionau | 
| Original name | Міхаіл Аляксевіч•Сямёнаў | 
| Other names | Mikhail Alekseyevich Semyonov, Михаил Алексеевич Семёнов | 
| Born | 6 February 1986 in Ostrov, Pskov (RUS) | 
| Measurements | 168 cm / 66 kg | 
| NOC |   Belarus | 
| Games | Discipline (Sport) / Event | NOC / Team | Pos | Medal | As | |
|---|---|---|---|---|---|---|
| 2014 Winter Olympics | Cross Country Skiing (Skiing) |  BLR | 
Mikhail Siamionau | |||
| Sprint, Men (Olympic) | 48 | |||||
| 15 kilometres, Men (Olympic) | 59 | |||||
| 50 kilometres, Men (Olympic) | 17 | |||||
| 30 kilometres Skiathlon, Men (Olympic) | 23 | |||||
| 4 × 10 kilometres Relay, Men (Olympic) | Belarus | 14 | ||||
| 2018 Winter Olympics | Cross Country Skiing (Skiing) |  BLR | 
Mikhail Siamionau | |||
| 15 kilometres, Men (Olympic) | 38 | |||||
| 50 kilometres, Men (Olympic) | 40 | |||||
| 30 kilometres Skiathlon, Men (Olympic) | 42 | |||||
| Team Sprint, Men (Olympic) | Yury Astapenka | 14 |