| Sergei Yefimov | |
| Fullname: | Sergei Dmitrievich Yefimov |
| Height: | 1.85 m |
| Birth Date: | 15 October 1987 |
| Currentclub: | FC Lokomotiv Moscow (U-19 assistant coach) |
| Position: | Defender |
| Years1: | 2007–2010 |
| Caps1: | 24 |
| Goals1: | 0 |
| Years2: | 2010 |
| Clubs2: | → FC Dynamo Bryansk (loan) |
| Caps2: | 8 |
| Goals2: | 0 |
| Years3: | 2011 |
| Caps3: | 9 |
| Goals3: | 0 |
| Years4: | 2011–2013 |
| Clubs4: | FC Khimki |
| Caps4: | 34 |
| Goals4: | 0 |
| Years5: | 2013–2015 |
| Caps5: | 9 |
| Goals5: | 1 |
| Years6: | 2014 |
| Clubs6: | → FC Zenit Penza (loan) |
| Caps6: | 1 |
| Goals6: | 0 |
| Years7: | 2014 |
| Clubs7: | → FC TSK Simferopol (loan) |
| Caps7: | 11 |
| Goals7: | 0 |
| Nationalyears1: | 2007–2008 |
| Nationalcaps1: | 2 |
| Nationalgoals1: | 0 |
| Manageryears1: | 2020– |
| Managerclubs1: | FC Lokomotiv Moscow (U-19 assistant) |
Sergei Dmitrievich Yefimov (Russian: Серге́й Дмитриевич Ефимов, born 15 October 1987) is a Russian football coach and a former player. He works as an assistant coach for the Under-19 squad of FC Lokomotiv Moscow. His position was defender.
He was called up to the Russia national football team for a qualifier against Estonia because of a large amount injuries to key defenders but did not play.