| Sergei Osadchuk | |
| Fullname: | Sergei Ivanovich Osadchuk |
| Birth Date: | 18 October 1982 |
| Birth Place: | Shevchenko, now Aktau, Kazakh SSR |
| Height: | 1.66 m |
| Currentclub: | FC Luki-Energiya Velikiye Luki (manager) |
| Position: | Midfielder |
| Years1: | 2002 |
| Clubs1: | FC Spartak Lukhovitsy |
| Caps1: | 37 |
| Goals1: | 0 |
| Years2: | 2003 |
| Clubs2: | FC Pskov-2000 |
| Caps2: | 23 |
| Goals2: | 4 |
| Years3: | 2004 |
| Clubs3: | FC Ural Yekaterinburg |
| Caps3: | 31 |
| Goals3: | 0 |
| Years4: | 2005–2006 |
| Clubs4: | FC SOYUZ-Gazprom Izhevsk |
| Caps4: | 52 |
| Goals4: | 6 |
| Years5: | 2007–2008 |
| Clubs5: | FC Lukhovitsy |
| Caps5: | 38 |
| Goals5: | 3 |
| Years6: | 2008–2010 |
| Clubs6: | FC Volga Nizhny Novgorod |
| Caps6: | 35 |
| Goals6: | 4 |
| Years7: | 2010 |
| Clubs7: | → FC Chernomorets Novorossiysk (loan) |
| Caps7: | 20 |
| Goals7: | 1 |
| Years8: | 2011–2012 |
| Clubs8: | FC Ufa |
| Caps8: | 44 |
| Goals8: | 1 |
| Years9: | 2013 |
| Clubs9: | FC Tekstilshchik Ivanovo |
| Caps9: | 25 |
| Goals9: | 2 |
| Years10: | 2014 |
| Clubs10: | FC Pskov-747 |
| Caps10: | 7 |
| Goals10: | 0 |
| Years11: | 2014–2015 |
| Clubs11: | FC Volga Ulyanovsk |
| Caps11: | 16 |
| Goals11: | 1 |
| Manageryears1: | 2017–2021 |
| Managerclubs1: | FC Luki-Energiya Velikiye Luki |
| Manageryears2: | 2021 |
| Managerclubs2: | FC Luki-Energiya Velikiye Luki (assistant) |
| Manageryears3: | 2021– |
| Managerclubs3: | FC Luki-Energiya Velikiye Luki |
Sergei Ivanovich Osadchuk (Russian: Серге́й Иванович Осадчук; born 18 October 1982) is a Russian professional football manager and a former player. He is the manager with FC Luki-Energiya Velikiye Luki.
He played two seasons in the Russian Football National League for FC Volga Nizhny Novgorod and FC Ufa.