Sergey Bolshakov (born 6 June 1988) is a Russian professional swimmer, specialising in Open water swimming.

[1] He won the bronze medal in the 10 km open water marathon at the 2011 World Championships.

[3] He took up swimming at the age of nine in his home town, after being encouraged to do so by his mother, who was also a swimmer.

[2] He competes for the Central Army Sports Club (CSKA).

This biographical article related to a Russian swimmer is a stub.