| Sergei Mosyagin | |
| Fullname: | Sergei Mikhailovich Mosyagin |
| Birth Date: | 29 December 1937 |
| Birth Place: | Mozharskiy District, Ryazan Oblast, Russian SFSR, USSR |
| Death Place: | Moscow, Russia |
| Position: | Defender / Manager |
| Youthyears1: | 1950s |
| Youthclubs1: | ? (Podolsk) |
| Years1: | 1950s |
| Years2: | 1956–1958 |
| Years3: | 1959–1962 |
| Clubs3: | FC SKIF Moscow |
| Caps1: | ? |
| Goals1: | ? |
| Caps2: | ? |
| Goals2: | ? |
| Caps3: | ? |
| Goals3: | ? |
| Manageryears1: | 1963–1966 |
| Managerclubs1: | Znamya Truda Orekhovo-Zuyevo |
| Manageryears2: | 1967–1970 |
| Managerclubs2: | Russian SFSR youth team |
| Manageryears3: | 1971–1973 |
| Manageryears4: | 1973 |
| Managerclubs4: | Soviet Sports Committee (Football Administration) staff |
| Manageryears5: | 1974–1975 |
| Manageryears6: | 1975–1978 |
| Manageryears7: | 1979 |
| Manageryears8: | 1980 |
| Manageryears9: | 1981–1982 |
| Manageryears10: | 1983 |
| Manageryears11: | 1984–1985 |
| Manageryears12: | 1986–1990 |
| Manageryears13: | 1990–1992 |
Sergei Mosyagin (Russian: Сергей Михайлович Мосягин) was a Soviet footballer and football coach.
In 1970s after winning the 1977 FIFA World Youth Championship, he was awarded honorary titles of Merited Coach of the Soviet Union and Merited Coach of the Russian SFSR (Russia).