| Team: | Free Agent |
| League: | KHL |
| Former Teams: | Sibir Novosibirsk CSKA Moscow |
| Height Ft: | 6 |
| Height In: | 0 |
| Weight Lb: | 183 |
| Shoots: | Left |
| Birth Date: | 26 February 1988 |
| Birth Place: | Novosibirsk, Russia |
| Career Start: | 2006 |
Konstantin Sergeevich Alexeyev (Russian: Константин Сергеевич Алексеев) (born February 26, 1988) is a Russian professional ice hockey defenceman who is currently an unrestricted free agent. He most recently played for HC Sibir Novosibirsk of the Kontinental Hockey League (KHL).
Alexeyev made his Kontinental Hockey League debut playing with HC Sibir Novosibirsk during the inaugural 2008–09 KHL season.[1] [2] After spending the first 11 years of his professional career with Siberia, Alexeyev left as a free agent to sign a two-year deal to continue in the KHL with HC CSKA Moscow on May 1, 2016.[3] In the 2016–17 season, after just 16 games with CSKA, Alexeyev was traded back to original club, Sibir Novosibirsk, on December 9, 2016.